Unlockhandsets is a cheater refund my money

So I used him for att semi premium and sent him over 1k imeis in 2 days. He started replying them slow and I got them marked unlocked from his side. I paid him 3.5k but should be paying more however he isn’t getting a cent till a gsx is provided for all imei. I am posting here to get his attention to show the imeis have not Been unlocked