Lying about compensation that was given

Last year December i raised a compliant about cell c sandton city due to the upgrade of my cellular contract and i requested i be compensated for my troubles and experience faced due to me been a customer for more than 10 years. Nelly from the call centre dealing with customer complaints calls me in January informing me cell c will compensate me 50% of my contract bill for the contract period and they will refund me for the amounts already billed. Come January i get billed 100% for the contract and february the same thing. When i queried i was told the 50% WAS ONLY FOR JANUARY this is inncorrect and i want to get the tape recordings of the conversation held with Nelly as this is not what she relatedto me. I am extremely disgusted in cell c for now lying . I want to cancel my contract as i have had enough with disgusting customer service and i do not need to be subjected to a network that are lairs. If you go into my profile you will pick up the lady Nelly i spoke to and get the recordings for what she had infomed me over the phone. I am not an idiot i asked her numerous times and she confirmed this so why is cell c lying.