Absolute poor paintwork done by Revamp-it

Revamp-it, Pretoria repainted my roof and issued a 10 year guarantee with a 20 year life expectancy but the work was so poorly done that the paint started peeling off after only 4 months. When I claimed repainting, they dodged the guarantee with lies and delayed the case for such a long time that they claimed prescription when I took them to court. (Lots of the undertakings in the contract were also not met by them).