Tomtop.com Very Disappointed Internet

Confident with many good reviews I decided to buy an smartphone from tomtop, usually make this kind of negotiation with another seller and never have any problems, the delivery was ok, but when arrived the phone battery heats too much and don’t supports even 5 hours of work ( it supposes to hold 2 days for this model... ), after trying contact buy email finally received a answer, they give me and address to send the defective phone, it was dispatched 40 days a go, and then the carrier said that the item don’t reached the destination, tomtop support says that is normal, and suggest that I fix the item here in Brazil when arrives, I bought a new phone, almost top of the line to get and defective one and fix it myself ??? Just want to be refund and buy a functional phone, not to be used as a lab for a bad item.