Can I sue for damages regarding lost wages and libel?

Question Details: I have 2 problems with my previous employer. Lost wages and libel. I think it was done in retaliation for whistleblowing. First of all, my last paycheck after I resigned is short by 7.5 hours. About 3 weeks ago, I discovered it and notified HR. Today, HR called me and explained it. My supervisor lied to the HR department about my vacation request and my supervisor lied to me about what hours the company would be paying me. So far, I have not received the money. HR said that they need to look into a few things and that they would get back to me. Also, I received a letter from the Vice President of the parent organization accusing me of coming back uninvited trying to participate in the senior center activities causing a disruption to operations. The letter threatens me that I should not come to the center or attend affiliated events unless I am invited by management otherwise they will take further action if I do not comply. The letter is a defamation of my character because I was verbally invited by the supervisor, senior center members and other employees to return to visit them at the center, attend their fundraisers and volunteer. These conversations occurred on many occasions with many witnesses before I resigned, after I resigned and the 2 occasions when I returned to the center. There is no policy that says we cannot come back to the center and there have been many times previous employees have returned to visit, attend the casino trip fundraisers, and/or volunteer. The same things that I wanted to do and was told by management that I was permitted to do. As a matter of fact, for the past 4 years I've actually been instructed by the company to contact previous employees who offered to help with events and ask them to volunteer. These accusations, threats and lost wages have caused me to become depressed, anxious and sleep deprived. I went to the doctor and was prescribed medication for my insomnia. This letter and the accusations can also cause problems with future employment opportunities because it is on record. It is possible for future employers to learn about the letter verbally/and or by documentation. Also, before this letter, I was planning on working with the parent company in the future. I'm relocating to my property up north and they have numerous job opportunities and locations up there. I think my supervisor and the company are doing this to me because I blew the whistle on them to the Allegheny County Area Agency on Aging earlier this year for a food safety issue and a workplace safety health issue in the kitchen. I even contacted our HR and told them that I was worried about retaliation from my supervisor and/or the company for reporting them. I told them that I felt that I was working in a hostile environment but HR said that only refers to sexual harassment. Since we are partially funded by the county and I was the Senior Center Coordinator I was responsible for food safety and reporting. My decision to close the senior center kitchen for one day and report them to the county had negative consequences for the company. I also provided one of the senior center members and one of the volunteers the contact information that they requested to report their observations to the county. My supervisor found out from the county that there were phone calls made by consumers reporting their concerns about the kitchen and center area.

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