PATHETIC Service from CELL C Highveld Mall

I put in a request to cancel my contract with Cell C, due to no signal where I stay/work. A technician came out, and confirmed that there is no service. I received my SD number for the cancellation and was told to return the handset to the nearest Cell C, which is in Highveld Mall. I returned the handset, and luckily demanded a letter to confirm they received it, this was 23/10/2015. My contract was then supposed to end on 30 November, and my number switched to prepaid. Well hello 1 December there is my data, my minutes for the new month. I phoned immediately to find out why this was done, only to be informed the contract is still active and there is no indication of cancellation. I eventually got hold of someone willing to assist me, and Ayanda has been very helpful. She discovered the phone was never checked into the head office. So after trying to get hold of Cell C Highveld mall the whole afternoon on the 1st, eventually got hold of them this morning. And surprise! The handset is still there. they are awaiting instructions. This is the most pathetic and unprofessional service I have ever received. It's a network cancellation, how difficult can it be