
Quoting
Mark47n
1st: How old is the panel in your home? The cost of breakers can be dependent on this fact as older (and more dangerous, discontinued) equipment requires reconditioning and can cost considerably more. Sometimes as much as 5 times as much as one that is of simliar ratings and new.
2nd: Billing...I wouldn't pay a cent on the additional charges. The BBB is not a governmental or regulatory agency so complaining to the is like complaining on FB. What other work did they say that they provided? There probably wasn't a written estimate but if the're looking for additional monies than I presume they included some sort of invoice.
As to the breaking and entering I would contact the police and ensure that the contractor is mentioned by name. That's all there is to it.