Line cancellation issues

Hi. I've cancelled my account effective from 01/07/2015 and I'm still getting invoices for periods after that. I've contacted Telkom end of May to supply my month's notice where I was promised that my account will me cancelled. Since then I've mailed, called and logged enquires on Telkom's website even logged an escalation request, but still no feedback was received from Telkom for 2 months. On top of that I'm still waiting for someone to contact me with regard to the refund of my deposit due to cancellation.<br> Regards