bad installation carried out without appt

I took my elderly friend to purchase a DSTV decoder with installation voucher deal at Game. <br> My friend telephoned the number on the voucher and was told an appt would be made within 5-7 days. Instead the next day she returned home to her 96 year old husband and discovered someone had been to installed the dish on the wall next to the front door not the roof and left wires trailing everywhere, even stuffing some in a cupboard. There are adaptors left on the floor and she cannot change channel. She was supposed to be shown how it all works and this guy just came did a **** job just wanting to be paid.<br> He even took the voucher so we no longer have the 0861 number to call. We did phone him as he said he would return that same night. He didn't and now his phone does not work. Please help!