Legal Question in Civil Litigation in Maryland

Re: overcharge of service provided

Your problem is a textbook case of why lawyers say that "an oral contract is not worth the paper it's printed on". In other words, it is far more difficult to prove the terms of a contract and whether or not they were breached when there is nothing in writing.

You should certainly countersue for the cost of correcting the work that was improperly performed. I suggest you get another contractor who does the same kind of work to inspect the project and be able to testify about how the sub you hired messed up the job and what it would cost to put it right. Perhaps he can also testify as to the reasonable cost of doing the job right in the first place to back up your contention as to what the price you agreed to pay was. You should by all means get legal representation, assuming there is enough at stake to justify legal expenses.

Re: overcharge of service provided

You should consider a counterclaim, as your failure to do so, should he prevail on his claim for the bill even in part, may bar your claims. See a lawyer about this, as it is a difficult kind of case to prevail on without a lawyer.