Does not cancel contract and continue to take monthly debit order

I have been trying to cancel a contract of a person who passed away. Cell C's service level agreement says it will be done in 48 hours. Nothing. And what is more, they continued to take the premium from the bank account. No one is prepared to help - 6 times in the last days I tried. Customer Services says one can't speak to cancellations/credit department. Numerous emails, but just no response. Is this the MO of CellC to get extra ******* income, by taking debit orders for a contract that should have been cancelled. I can see my e-mails being read. If this is not addressed soon, I am going to name and shame those people publicly.