workmanship & quality,what a disgrace

I bought a property in Kempton Park with 15 year guarantee on the waterproofing & skylights.The waterproofing & skylights were installed in Febuary 2012,by the end 2012 the contractors had to repair leaks to waterproofing and skylights numerous times and only after there company was listed on \HELLO PETER".<br> December 2013 the leaking started once again but worse"