TELKOM- I await your promises

I am now at my wits end. I have been complaining since December 2014. My vodacom, contract came to an end, and Telkom, offerd the best package and handset. I took out my contract at the Knysna Branch, and the service was great, I especially asked them, what the coverage was like in Keurboomstrand Plettenberg Bay, and was told they had excellent coverage. Well what a crock of BS. I have no call or data signal at home, as in nothing. I have sent so many emails, and made so many calls, all to no avail. I have had so many false promises, lies, and BS. That I do not know what to do anymore. I am a business owner, and I rely on my cell phone for business. But I once again state. I HAVE NO CALL OR DATA AT MY HOME! Telkom ***gy backs on MTN, I have had somebody from Telkom Technical in Port Elizabeth come do a signal test at my home, and he agreed, NO SIGNAL WHAT SO EVER. I was then promised that they would put a signal booster in my house, this was 3 months ago, and still nothing! NOTHING!!!!! NOTHING. I have made call upon call upon call, complained on Facebook, emailed ICASA, nothing helps. I cannot cancel my contract as I would have to pay huge penalties. WHAT DO I DO TELKOM, DOMKOM?