Removal of number I don't use

I have heard people saying it is difficult to cancel a contract with vodacom but I thought they are overreacting. But boy was I wrong.

I had a data card contract with vodacom and removing that contract has been a nightmare even after I got confirmation that it will change to prepaid last year December because apparently they cant remove the number all together, which is weird to me, but now I'm get billed for extra charges because they somehow converted it back to contract without my permission or knowledge.

When I request for them to remove the number on my contract they refused and this number is being used by someone else so am suppose to pay for someone else using this number because vodacom refuses to remove it from my contract list.

Furthermore I have to wait a full 30 days for them to convert it back to prepaid because it's a cancelation of contract f which again I didn't ask for.

If this matter is not resolved I am taking it further to the ombudsman or whoever because they billing me for a number I don't use they adding a contract to said number of which i didn't ask for.

I refuse to be billed for something I am not using.