Boksburg Pool Renovators

Boksburg pool renovators renovated our pool 4 weeks ago. We have 2 year guarantee on work done and 5 years on the paint app****. Day 3 our pool showed spots all along the sides of the pool where they sanded. I made them aware of the issues. The owner and his wife disregards my calls and messages send. Then I also noted they created another pool business nl Wesrand pool renovators. Quality of work poor, no supervision nor a final inspection on work done. Now they ignore me totally.All I am asking is to come and inspect problem and fix the issue.