Faulty line since installation

Two and a half weeks ago my line was installed by a company contracted by Telkom to do line installations. Since installation of the line it hasn't worked properly for a single day. I have logged a fault with Telkom but nothing has been done and today I received a bill for this line. This is unacceptable service delivery and either Telkom needs to credit the invoice or they need to sort this line out ASAP.