MasterCare Rip-off

My frail pensioner mother had a service contract with MasterCare for an old Tedelex TV. In 09/2012 I purchased her a new flat screen TV and advised her not to take out a new contract and to cancel the existing one. On 24/10/2012 she wrote to Mirinda at MasterCare cancelling the service contract. I have the letter and the fax confirmation slip. She then signed a Stop Payment with Standard Bank on 29/10/12. She was not well and did not study her bank statements. Recently she noticed that the debit order was still in place, 3 years after cancelling. In another scenario this would be called theft. I am abroad and feel helpless as I have been trying to contact any branch of MasterCare but to no avail. Is there a geographical number on which they can be reached as opposed to an 086 number. So for three years she has been paying a premium for a TV that she no longer owns.