Fed Up with MTN!

I am so fed up with MTN they just can't seem to get this right, everytime i have to upgrade my contract there's an issue... My data sim ending in ******5344 came to and end this month, on the 8th Nov i spoke to Thabisa from retentions and we agreed to downgrade my contract and she assured me it would be done by 1st December, come 1st Dec nothing happened and I've been calling but they giving me different stories, i then sent an email to cancellations Dep requesting to cancel my contract on the 6th Dec and to date no response, yesterday i called and asked to speak to a manager they said she will call me back and i told them if i don't get a call back by COB i am writing to Hellopeter today, and guess what here i am finding myself writing, which means they don't put me as their business client for 5+ years as a priority. This is the end of my relationship with MTN, when my last contract ends i am gone.