Frustrated customer

I took a Telkom Router with Mondo and everything was fine, after a few months I had a connection problem when I get home but at work it was fine. I would call their customer service and we'd do settings and it will be fine after sometime until a point where when I get home it doesn't work anymore . They told me they'll send a technician and he came, he failed to fix it because he had to put my router on top of the fridge for it to work, he then told me that he'll come back within 7 days and he didn't. I had to call Telkom now and then because the router wasn't working but they were deducting money from my account whereas I had to buy data again for home use, until I decided to stop using it and reverse their debit order as I couldn't get any help. After months I got a case number ***2 and they said they attending my case. I later received a call from them and they told me that they have a problem with the tower where I stay and it could take up to 4 to 6 months for them to fix it and I should decide whether I want to wait and continue with the contract or cancel, I told them I want to cancel and they said they'll put my request to the cancelation department. A month went by without any communication and I'll have to call and scream to their consultants because am frustrated and they don't stop deducting my money. I decided to go to Telkom Southgate and the lady told me that they requested a courier to collect their router and when she asked if she can take the router from me and continue with the cancelation the answer was "I can't answer that" from the person she was communicating with. I really hate Telkom for doing this to me because I didn't just want to cancel the contract but because of their poor service and not caring about their customers, I have to reverse their debit order because every month it's increasing and am not using their services any more. What's affecting me the most is that the lady at the bank told me that reversing their debit order might affect my credit record but I guess they don't care. Telkom is useless and I will preach to each and every one I get a chance to because they only care about our money!!!!