We have an issue with our vendor, disputing the pricing that was quoted and later charged.

We had been working with a vendor for a bit more than a year and lately we have had a falling off with them. We now are seeing that their prices are increasing dramatically. For example, they quoted out a gear package for 158k and when we counted up the pricing it turned out to be closer to 180k. This was with five minutes of looking and if we go back to miscellaneous materials odds are we will find double dipping's. Please advise.