Bad service from Telkom

The level of service I've received from this service provider has been way below par. I've have raised a few complaints in the past and have been given case numbers, 'someone is going to look into your concerns and get back to you' till this day, I am yet to receive feedback on any of the issues I've raised in the past. Latest issue I have with them is, I requested to add wifi on my landline and the agent I spoke to in the contact centre (188) told me it would be R100 for 10 gigs, which was a special promo. I receive a bill for nearly R400, which is obviously not what i signed up for. I called the billing team and spoke to 'a manager' in the Cape Town office, who promised me to look into this and get back to me. It has been over a week and the case number i got from the call centre ********** 6, I am yet to get an acknowledgement or let alone an indication on when someone will be calling me. I AM BEYOND UPSET WITH TELKOM AND WOULD NEVER RECOMMEND THEIR SERVICE EVEN TO MY ENEMIES.