Expired Contract

I had contract with Cell C that expired in February 2015 on a IPhone 5 . I have blocked my phone and in order for Apple to assist me they need proof of purchase. Now trying to obtain this from Cell C has been a nightmare. I went to the cell C branch at Eastgate they could not help me . They referred me and said I must call 084145. I was transferred 10 times talking to Noluhlelo,Sithembiso Sipho, Sithembile Kelvin Etc. None of this people were able to help including the manager of customer care. Who was not prepared to take my call but rather speak to me through the agent Sithembile. What puzzles me is that how is possible for the company that debited my account for 24 months not be able supply proof of purchase. I had a contract that I paid faithfully for 2 years. I am stuck with a phone that I legally bought and the Cell C cannot assist.