Incorrect fibre installation

Pathetic Company. I took out a fibre contract with Octotel via Mweb. Upon installation the Octotel guys inserted the cables wrong and refused to fix it. They want to charge me R1500 to come out and reinstall the cables that they did incorrectly. It's been almost 3 weeks and they have not called once to find out my side and just believed their workers. They are now blaming my father saying he changed his mind of where the cables should be but they already bent the cables the route they wanted to use when he came to show where he wanted it. They never advised that the cables were going to be secured on the ground. I immediately called Mweb and they a asked if I signed anything approving the installation, I said they didn't ask. While I was on the phone with mweb, the Octotel guy came over with the book wanting me to sign . I told him I will not sign anything till I'm done talking to mweb. The two guys got cross and just drove away. They never let me know if the installation was complete or not. How unprofessional and pathetic service. Mweb advised that because I had not signed anything I won't be held liable for extra charges. Mweb logged the complaint and I was told Octotel would contact me within 72 hours, it's been almost 3 weeks. I have been with mweb for about 8 years and I cannot believe that they are not fighting for me as a loyal customer. They said it's Octotels word against mine. At this point I wish to cancel the contract just so that Octotel don't get their way.