Disgusting Poor Service at Cell C and Cell C Kolonnade

I am utterly disappointed at the kind of service I have received from Cell C and Cell C Kolonnade in particular. I went to apply for X2 data sim contract on the 10th of January 2019, the contract was approved and I specifically requested that the contract be capped at the amount of the contract as I do not want to pay any additional costs, that was fortunatly done in the branch and also signed a contract stating such. To my surprise on the 17 Jan 2019 I recieved an sms stating I have used up my data including value added services of R518, my outstanding amount is R718 for each sim card. A 7 gig for each ran out within 6 to 7 days. I phoned custmer care who informed me my contract was added with out of bundle service to the value of R518. I then asked them to stop this value added services with immediate effect as I not signed and not authorised anyone to add any amount or services to my contract. I also went back to Cell C Kolonnade and through their mini investigation found that the system might have technically increased the limit of my contract. I was told to that I should send an email, stating my complain and to also request for documents which I had signed. I sent the email the following day which was the 24 January 2019, I also phoned the store to confirm if they had received my email because my email had not been acknowledged. Jeandre the store manager as I was told answered the phone and told me he had not checked the mails but I should resend it with my contacts, which I did. He promised to call me back but never did, I went to the store again the following Monday, Spoke to Tasneem who phoned Headoffice to enquire and told me they will investigate further and she will give me a call on Wednesday the 30th as her and the manager will not be at work on Tuesday the 29th. On the 31st I went to the store again, spoke to Nompilo who said they are still investigating they will give me a call on friday. its friday today, its passed midday and No Call, No Feedback. I am disguted at the level of poor service and a rather costly service I have recieved from Cell C. I have indicated in my email which was not responded to that I intend to cancel my contract, as I cannot deal with such service for a full 24 months. Cell C should be ashamed of itself.