Disgraceful Telkom (Fourways) Service

I bought a laptop from Telkom (Fourways) in September last year. The MS Office Product Key had already been activated prior to me purchasing laptop and never worked. After months of trying to resolve the problem, the Regional Manager Andrew Armstrong instructed I get a Product Key, which I got and expired after 2 months. I have been to the Telkom Fourways over 10 times, sent numerous emails, made phine calls (no one ever picks up landline) and I keep hearing that the matter has been escalated and Andrew Armstrong will contact me. Which he has not responded to date. I got his email address and sent him an email, which he has not responded. I have been paying for a laptop I can not use and Telkom have treated me disgracefully!