Terrible after service

I contacted onCallSA with regards to having grouting done and organised and paid a deposit for the work. The job was subcontracted to Absolute Plumbers who were supposed to arrive at a specific time and date. They did not adhere to this and after endless calls and excuses they arrived a day later. I am not happy with the work done and have called numerous times to resolve this. The company keep saying they will get back to me. This has not happened.