Business ProfileforSprague Structural Solutions

I hired this business to repair my driveway and sinking back step. And initially I was pretty happy they gave us some pretty reasonable quote of $4,661. Seems reasonable right? Well due to weather we had to split up the front and the back which resulted in us making three or four separate payments. Being the deposit, and other being for the front, and one being four the back, and the last being for the alleged outstanding balance. Well after they completed work on the back, They decided a week later to send me an email that stated I owed them another 917. According to the contract we were to pay upon completion of the work which we did. So for them to be calling, emailing while continuing to have inaccurate information is really suspect to me. And when I called to make another payment for the fourth time of the alleged 917 that I owe them, they couldn't offer. An explanation is to what happened other than "we're sorry." Then tried to put all the blame on the guy that did the work that collected payment while not taking responsibility for the emails that I received telling me to disregard the alleged outstanding amount. Because to me an estimate is an estimate and not necessarily the entirety of the bill. Sometimes you don't need as much material so maybe it doesn't cost as much, but when I asked that question. Bethany just said she didn't know. So I would like either the owner or somebody that is actually in charge to give me an explanation as to what happened and why, because honestly it's really shady to me and I am not happy. And yes, I understand mistakes happen but your inability to provide me with a reason other than oops, Sorry is unacceptable. And yes you're probably just going to site the estimate but when you tell me the foreman can't give me a reason as to why it was a different amount. Sounds to me like there's some shady stuff going on here. Like maybe you didn't need as much materials and that's why it wasn't as expensive and you're overcharging.