wrong installation

On the 21st of October, Walter from Dstv in Boksburg, had to come and correct the signal of our explorer. The previous technician did not do a good job that's why we could not watch box office nor could we watch catch up. Walter told me that the previous technician put the wrong stuff in that's why there was no signal. Instead of just fixing the signal he installed 2 different parts. That costs us R999. Before he left I asked him if I put another TV upstairs can I just plug everything in, because the cables are there already. He said yes, it won't be a problem. The TV upstairs can't work because he disconnected the one cable, the message on the screen says, defining foot print. I went to their office this morning and they said that he will come and fix it. When he arrived this afternoon, he told me he will not fix it for free, it's my fault because I told him there's no TV upstairs. My question is, the instructions to dstv office was clear, they must fix the signal, he did not have to install any parts because it was not necessarily. The TV upstairs would work perfectly. This was purely a money making *******. Could you please help me to solve this problem. Reg Louisa