useless in the help department

hello there, on 31st of August last year I purchased a xiaomi robovac ( worth approximately R5000) from LOOT for my elderly aunt who was just run over by a car and had a hip replacement. she received it on the 10th of September and was working well until the 1st of February when it started giving filter issues. Even upon replacing the filter it still didn't work so we turned to Loot the place of purchase as this item was only five months in use, very well looked after and clearly still under warranty. on two occasions, phone calls were made. Loot REFUSED to take this item back and have it checked, but what's more they also REFUSED to give me the name of the company or person from whom they have sourced it, so I could take it up with that company. they did however give me the number of MOBILE IN AFRICA where I could possible have it checked and repaired. so we did just that. Four times they had it picked up via courier. And four times we received it back with the original fault and was told to return it to the point of purchase. but how on earth do you return something if the point of sales refuse to take it back or give you the name of the person from whom they have sourced it. We have asked that you ignore the warranty and treat this unit as if it had run out of warranty and repair it and we would be happy to pay for the repairs as our only other option will be just to throw this expensive still under warranty machine away. the last email I've sent was answered after more than I week merely stating that MOBILE IN AFRICA can't service any products that wasn't purchased directly from them. Would be nice if somebody could tell me who would be willing to help us. I wonder.....is it true what I hear....that MOBILE IN AFRICA are indeed sourcing most of loot's xiaomi appliances?