Bad Service from Multichoice

Extremely Bad service First of all i have being a loyal client with multi choice for a while and am always paying my two Decorders on time ,So to speak am always on credits even now.After my old decorder was defaulted two weeks back i took it to the nearest Multi choice store to be exchanged as a norm (i have insurance). I was Gaven the new HD decorder which later did not work,To cut the story short i have exchanged the similar decorder for about three times with no avail,Even now as i speak im watching a blank screen.

To make the matter worse they have provide us with contact details that does not function,I have sent more than 5 emails ********** )to query these useless new Decorder without any response even up to these date sense last week Sunday.....................................................