cancellation of ugprade contract not been honored

On 1st of August a person from Sama Mobile Data phoned to make my upgrade easier. I then agreed to the upgrade. 2nd August I went to the MTN store Pavilion Durban to be told the upgrade I did over the phone was not what I wanted and I am within my right to cancel. 3 August I phoned 808 and spoke to Luciano to cancel this upgrade contract. At this stage this person told me that it is not a problem but it will take a day or two as the contract had already been approved. On the 11th August I received my data bundle and it was for the upgrade I had cancelled. I phoned 808 to be told that the contract was never cancelled. I was then given another number to phone to cancel the upgrade. I phoned this number ans spoke to Sindi, she said she will send an email to the cancellations department. On the 12th August I phoned the same number to be told MTN does not do cancellations over the weekend. I then phoned 808 again to be told the same thing. I then spoke to the manager on duty Snthembile Ntaba who told me that they will send an email to cancel this upgrade as MTN CANNOT do cancellations over the weekend. I then went to the MTN store in Pavilion Durban to find out what to do. Spoke to Fazila and she said all she can do is send an email to cancel this upgrade contract. I phoned 808 again on the 14th - spoke to Lerato who told me I must wait another day. Phoned 808 again on the 15th - spoke to Mbali still no news. Phoned 808 later that day again and spoke to Angilique - she told me that 808 MTN call centre cannot do anything I must cancel it with Sama mobile data direct! Phoned the number that Angilique gave me - waited for 15min on hold, eventually my call was answered by a person by the name of Luciano!!!!! Luciano then told me the upgrade still has not been cancelled but he will send an email again to cancel this upgrade. He will phone the courier company as well to tell them the contract has been cancelled so not to deliver the phone. Luciano told me he will phone me back the next day 16/08. 16th August I phoned Sama mobile again! Waited on hold for 15 min again. Asked to speak to Luciano, who was very apologetic because he did not phone me back. He tried to explain that he has been trying to cancel this upgrade but to no avail. He could not tell me where the problem lies re cancelling this upgrade. Luciano phoned me again on the 21/08 to tell me that the upgrade contract has still not been cancelled and he now got his manager involved and I should have an answer by the end of day (21/08). Now a week later 28/08 I still have not heard from Luciano or anyone else re this cancellation. Could you please assist in this matter as I don't know where to go from here!