Telkom SA

I have a 10mb line from telkom and the bill me for the last couple of months for that but only a 2mb line is available in my area , I have send telkom a e-mail but did not received a response back , it also does not help to phone 10213 ( Telkom Sales ) but there is no one that answer the phone , the last time I spend 45 min waiting for someone and still not received any assistance

I need Telkom to credit my account for the extras money that I paid and did not received the promised service.