Telkom the worse!

I app**** for a laptop contract at telkom,on contract approval the laptop wasn't available in store.i went back after 3 days and still the same thing, I opted for cellphone instead bcz I was tired for telkom same story the delivery is coming. I got the cellphone with no problem,but I didn't know I am creating more problems. After a month the bill comes with R17562.00 .I went back to the telkom shop and ask wat was the problem they told me it's an error the billing dept thought you received the laptop and brought it back.i ask them to wave the charges but till now my account is blocked nothing is happening I went to the store manager but no fruitful help from him.tried to call customer service but they still refer to this un competant people.the billing dept is just asking them to provide proof customer didn't take the laptop but they are failing to do that simple thing.pliz may you assist to get hold of telkom management email address or fone numbers ,thank you,l am very disappointed with telkom!