Wors online service

I did buy 2 week ago and blood pressure monitor rechargeable, after a week battery was empty, try to recharge with ubs cable provide with the machine didn't charge at all, send a return requeste,they send my back all done we are collecting the item at your address,. That was the 12 of March, yesterday I send and email asking when will happen and they send me a case number, I want my money back and someone to collect this unless monitor as I need to buy a new one.