Worst service from mweb, will never rever you'll to anyone

I initial had zoom fibre which i was paying R499, which then migrated to mweb and the billing changed to R599 without notifying me, and when i decided to cancel the service, however i was retained and advised if i take up a cheaper line with my mweb for R489, my last bill (R599) i will pay for the old line will be for April and that amount will be reimbursed to me or used for the new line, which was not done, I was also advised once the new line goes active the old line will be cancelled, which was also not done. When i received me billing for May it shows I will be billed R1527,11 which was incorrect and after calling in and speaking to a consultant, I was advised i should only pay around R400 for the new line after working it out and a credit was logged, however when i called back today the 18th to follow up on the credit, i was advised the credit is logged and i should pay around R500 plus when i explained it to the consultant he suggested to me i must update my banking details until the credit is approved and the query is rectified as what i explained to him was not logged , which is bull****, it goes to show the consultants didnt listen my query and mweb is robbing the people, I have been trying to speak to a manager, however none of them wants to take the call or call me back, I have been calling on numerous occasion for this to be resloved and have to wait for more than 20 minutes to get hold of a consultant and still get no assistance, I have wasted more than R500 airtime trying to resolve this query and it is still not resloved