Getting hold of Contracts department for account changes and cancellation

So My contract date expired in December and I have been trying to get in touch with MTN Contracts Team to cancel my one number because I do not use this number anymore. I have tried an online request late November 2017 and during December 2017, with no feedback. The call center also cannot seem to transfer me to the contract team as I am prompted for the same menu items, and end up back at the call center agents. I have gone through this cycle again today, and after 29 mins with 25 mins being on hold, and the other 4 mins speaking to someone who can't help me. This is very frustrating to say the least, and because using profanity is frowned upon.