Assistance and bad installation

I am from George and work in Pretoria now. My father has purchased an Dstv decoder inclusive installation but the installer has done something wrong there because there kept popping up cable error. Now both tv's at George home give the cable error. No one helps them. I kept phoning without any success, someone would have called them yesterday but up to now no one from DSTV phoned them I cannot affort to pay technision to help them. I pay the DSTV every months after it was linked to my account because my father is pensioner. The other disches and installations kept on for years until dish has rusted but this new installation faulty since beginning