Poor service from Telkom

I signed a contract with Telkom in November 2017 for an ADSL line.After a lot of phone calls from my side they just phone today (20 March 2018) to tell me that the line is not going to be installed as the cables are regularly ****** in our area and they are cancelling the order.How can they just cancel a contract?They assured me the day I signed that they will be able to deliver the service.RIDICULOUS!!!!!! I am sending this to the ombudsman.