Service cancelled but still being billed

I am now at my wits end with Telkom, and I need this sorted out ASAP!! I canceled my landline and my ADSL on Monday, 19 February 2018 12:03 PM, I received the Reference no ********** . But yet i am still being charged, and now i am being charged interest for LATE PAYMENT!! I need all invoices credited and my credit record cleared IMMEDIATELY!! Every month I send an email to ********** and every month i receive an SMS saying it has been sorted out but then i receive another invoice the following month!!

Yet this month I complained via Facebook chat, NO response - posted on Telkom's Facebook page - NO response. Emailed, NO response.