Final bill instead of a refund???

Despite many many many calls to Telkom, trying to cancel my service and explaining that I was moving abroad, I still received a bill from them instead of a refund when I was paid up until the end of May 2016. The reason? Contract forfeiture! Despite the fact that they made several mistakes when my line was meant to be transferred to a new address and then starting it as a new contract. Well. I would like to challenge that and ask them to produce my signature on a do***ent starting that contract. As per usual, I cannot contact them by email and being abroad, cannot even phone and wait for several hours to be connected. Making us proud again, Telkom... NOT.