No response / No Help / No Nothing

I have a tablet insured with C-surance. A week after it was insured my son tripped entirely by accident, and damaged the unit. I took the unit into Cell C at Oakfields Benoni to have the tablet repaired. I was told that it will be sent away and filled in all the paperwork, Four weeks later, no response, and no tablet. Three trips to Cell C and finally they found my tablet, and assured me I could collect the following week as it was with the courier. I collect the tablet only to find that it hasn't been repaired, and no correspondence was received as to why... Annoyed, I tried to contact the C-surance call center... after waiting 15mins on the phone they cut me off... this has happened now about 15 times... I have sent about 30 e-mails and have had no response... I am at my wits end, and have no idea how to take this further. The people who I have managed to get through to, have no answers, are rude and still cannot help me... This is just unacceptable. Somebody please assist me.