BAD SERVICE

A company called Mondo phoned me asking if I would like 2 x sim cards for R89 per month so I said yes BUT I want to keep our phone numbers and they said no problem after receiving the sim cards it was a issue to keep my old number so I told them to collect the sim cards as I don't want it any more that was Aug 2017 ever since then I got billed from telkom anything between R250 to R500 each month for sim cards not even opened still in my draw. I have been phoning and emailing the same stuff over and over eventually Telkom cancelled my "contract" March 2018 NOW i want my money back because I have been paying for stuff never been used this morning I was told I will have to pay a cancellation fee. They must be joking I have never see so much bad service from any company it is ridiculous.