Unsatisfied Telkom customer

I have been trying to get help from telkom regarding an error in their billing for more than a year at Walmer port Elizabeth. I have not received help until up to date, I requested an email address for the head office and was informed there’s no email address. Each time I’m am told there was no case logged by the previous person that helped you repeatedly, what should I do? All telkom does is send me threats about my unpaid account but do not allow me to communicate back to them and explain the error. I consulted a lawyer but he has no where to send emails. I don’t understand what kind of a company is telkom, I have been off service the whole year, no one cares about the inconvenience it has caused me! Please someone from head office in telkom help me I don’t know how to contact you. Regards Dr MNdamase