Terrible Service

I upgraded my contract in July and have called in to cancel within the same month. Was assisted by Nqobile Langa who in the beginning was very helpful and convinced me to keep the contract with better benefits such as extra minutes and data, however would have to collect the devices and re-do the whole contract again. This has been going on since July, I have made numerous calls, spoken to various people who have been given me different stories re this contract, I have been told that these devices would be collected many times and still nothing seems to be done about it. I have left many messages for team leaders/ manager to call back and no one seems to care. I have been a long standing client of Vodacom and I do not deserve this type treatment.