Unresolved problem

I bought my DStv decoder in December 2020 and on the 06th of June it started showing E30 error and I did everything of self-service to clear the error without success. I called multichoice they also tried while was in the line and without success. They then told me to go to nearest agency and when I went there on the 07th June they checked my device and said it is faulty it won't clear the E30 error and that I should get the replacement since my device is still under warranty. However they said they don't have stock I should come the following week, which I did and still told no stock another week I went there to be told the same we don't have stock. Then I decided to call before I go there to check if they have stock and as always when I call they say no stock even today 23rd July still no stock. Ive been in contact with Dstvcare on twitter they tell me they can't help me it's only the agency that can help me,. I keep telling them that I've been in and out of the agency always they don't have stock to replace my device and their Dstvcare final answer was there is nothing we can do to help you in our side. I suggested to them that they themselves as headquarters call the agency to reserve me a decoder and call me but they said it's impossible.

The agency I went to is Tzaneen Radio Centre