You have taken payment to provide a service, and then refused to provide the service. Either you have scammed the customer, or you will refund their payment. You have chosen to refuse to provide the service after you took the money paid for that service. That is the definition of a scam.
"...just believe that I scammed you, I am not arguing."
This has nothing to do with @null. Either you're a thief, or you're not. Your above responses directly state you have taken the funds of the customer and are a running a scam on Hive. Your refusal to refund the payment makes you a thief.