Failure to cance my contract as per request

On the 6th of April 2018. I ask Vodacom for premature quotation and they immediately sent it me. I than made payment and as per the quotation and fax back proof of payment and necessary document. I did not get respond that day and I then resent the documents on the 8th of April 2018, but still no response and the contracts I want to close they are still active. I have been phoning Vodacom and each time the promise that the contracts will be close before the end of business and today is the 18th of April 2018 and the contract is still active. I now fear because month end is approaching and they will end up putting data and airtime that I don't need and will say I owe them. really frustrated. I don't know what to do.

Elizabeth Mdiniswa