tracfone rip me off 4 years worth of minutes telling me that its not a tracfone and that is a straight talk phone Internet

 I bought a tracfone at a 7-Eleven in Buffalo New York. Then I bought some minutes a year's worth for $120, then contacted tracfone and installed minutes. 30 days later I contacted tracfone because the phone was shut down,they tell me its not a tracfone its a straight talk phone.the phone and shown it had several minutes left and 393 service days left. while speaking to my 3 or 4th representative,she was only able to give me 80 days with a credit for my years worth of minutes from tracfone. what's really going on please help!!!