Any lawyers here?

Okay so I work from home for this company taking calls from customers and helping them with their accounts. I have worked for them for 1 year and 11 months to the day. Yesterday I received an e-mail asking me to come into the office for a meeting. I arrived and my boss told me they realized I had several "short calls" from a couple months ago. I asked what does that mean? He said that the calls were hung up either by me or the customer hung up before they were greeted. He said they listened to 9 of them and there was nothing on the recording they just saw where I had hung up. Any time I hung up on a call was because I either had no sound or they couldn't hear me. I sent an e-mail right after each instance letting my supervisors know and that I had to restart. I have never been warned or anything about this type of thing and it doesn't say anything in the handbook about this even being a punishable thing. I feel like they just didn't want to pay me for my FMLA leave. I just had my FMLA approved and was going to get 6 weeks off paid. I had also been working 40+ overtime hours each pay period to earn extra PTO hours which I earned 41 but now they are saying I am not entitled to any of those. Is this wrongful termination?