Bad service

I have set an enquiry for a refund on a stove that was bought on Take a Lot, because Take a Lot needs a credit note from Hisense themselves so that they can refund me for this stove that was bought. I am struggling with a response for 3 weeks now and Hisense Customer service have not yet rep****. This is starting to affect my business I run a restaurant and it's affecting my clients, because I bought 2 of the same stoves on take a lot which was both faulty one was replaced but the replacement was also faulty and Take a lot then took it back but I still don't have a stove to continue my business with because Hisense still haven't sent me an credit note so that Take a lot can refund me, for me to buy a new stove. This is very poor service