In fact, nothing here would be out of line for any merchant account (except maybe the customer service issues).
2% chargeback rate is extremely high. It would get you shutdown pretty much everywhere. MSP agreements usually say between 0.25% to 1% for the chargeback rate limit. This is 10x what i've seen some banks specify as an acceptable chargeback rate.
And if you exceed it.. you get warnings, reserve lines and longer holding periods, and eventually the termination of your account. Exactly what happened to OP.
Each one of those actions should have been a red flag to the merchant tellling them they have a serious problem they need to address.