It seems clear from the HH email that it was fraudulent activity which brought OP to HH's attention. A further review, presumably to determine what ought to be done, showed that OP is a serial complainer, so HH fired OP as a customer.

Because OP has not provided the full facts, it is impossible to determine whether OP committed fraud. But, what is clear is that it is solely HH's decision and that decision has been made.

As to serial complaining, all customer-facing businesses understand that there is a balance and that there are some customers who cannot be satisfied, no matter what. Those customers are not worth it because they take time & effort and continue to tell you things which you likely know and are not intending to change.

That may sound harsh, but it is reality. I have no idea what OP did or what OP wrote. But, whatever it was, this is an out-of-the ordinary response from HH, so it was likely extreme.

If OP wants to provide some specifics, that might be helpful to others who are serial complainers. But, as to OP, why on earth do you want to pay for services at a place which does not want you?