Faulty decoder!

I purchased the new HD Decoder after my old stopped working around the 23rd of Feb 2019, within a week or two it started giving off unnecessary error messages about our subscription and then recently it stopped working with E30 message, i took to the Multichoice DSTV agency in Alexandra on the 27th March 2019 and i was told that it has a factory fault and these decoders have such issues and that I should come back the following day,28 March 2019 to pick it up as they will book it in, i tried asking for a replacement one or a refund but they said they will repair it, then I get a call while at work telling me on the 28th that the decoder was only being picked up that day and sent for repairs so i should come back on the 29th, I am quite annoyed that a new product is already giving me problems and the agency is not treating this as a concern otherwise they would have given the correct time frame as to when my decoder will be fixed. This is not on!!!