bad service

I am not happy about the service because dstv they approached me and they offered me an explora contract and they delivered the decoder within 7 days as promised but when i visit dstv in karen park crossing to submit the voucher for installation on the 06/11/2018 they did not come on the 1st of dec it was on saturday i called them to arrange with them so that they can come the phone rings no answer on the land line then during the wee on Tuesday the 4th of dec i went there personally to enquire at first point of contact i was send to another desk when i get there they act as if i dont know what i am talking about and they even said vouchers are not submited to them but the receipt that i have it was issued by them the address on the receipt is shp 2& 3 karen park crossing that is exactly where i was.So what must i do with the explora decoder then??????????