Frustrated customer

I am extremely frustrated with Telkom and really not sure what else to do since the company does not seem to resolve ongoing issues. I had an internet contract for the 10gig promo (24 months contract) with Telkom and since the 24 months lapsed I was running on a month to month basis and my bank account was still been deducted. On the 20 April 2017 I sent a cancellation form to terminate this contract since I will be moving onto the unlimited broadband with Telkom. Today I am paying for 2 contracts with Telkom when I only utilize the unlimited internet and requested the other contract be cancelled. It is now 8 months that my bank is still been debited for something that I cancelled and every time I call Telkom to query and get this resolved I am told that someone will get back to me and to date this has not been resolved and no one has called me regarding this issue. I am so upset I feel like also cancelling my unlimited internet as well. What is the point of having processes if you cannot follow it. I expect more from a huge company like Telkom. It pains me that I have to actually come on hello peter in order to get something done. I would definitely not be recommending Telkom to any of my family or friends, this is not the first time that Telkom has not been able to resolve a problem of mines.