Push to sign contract but no service provided

We have fibre at home, but after seeing the good deal from CellC we got saw from two sales we decided to end our contract with our current service providers and sign a new contract for what we thought would be a better deal. But the sales ladies just pushed us to sign the contract, and after we signed, no service was provided. We can't get throught to them, their numbers change, the customer care just passes the buck from department to department. And now we don't have any internet connectivity for me to work on. I've tried numerous times to get hold of the sales ladies, and 2 weeks ago they responded again, just to tell me they need more information, which I promptly gave them. But after that, they told me they are waiting for the fibre division to get back to them, I haven't received any feedback or correspondence from them yet. Even after several mails I sent. Our service was supposed to have been operational at the start of December. It's already a month late. This is shocking service. I can't believe they are getting away with this kind of service.