Trailer filter change

This is the most unfair, ridiculous trailer repair service we have ever experienced. $15 filter cost over $1,187.11. The driver called service that was showing on Truck Repair app 58 miles away. The answering service said the shop was closed on Saturday and it was also 200 miles away, but they can send a mechanic to change a fuel filter in his trailer. NO ONE CONTACTED ANY OF THE MANAGERS OR OWNER OF OUR COMPANY FOR APPROVAL OR ESTIMATE. They never even informed my driver of their miles or the cost of the repair and they never got an approval of charges from him as well. If we knew they had to drive more than 58 miles we would contact any other shop closer. For half hour work they charged $1,187.11 and said that bill included pay per mile, pay per hour and shop supply $85! Would love to see that expensive shop supply for a simple filter change! We contacted the service manager Rick and the owner Brendan to try to negotiate the price and they both said it was a fair price. They also said that their calling service could not tell my driver that they were closed or 200 miles away, which was a lie. They blocked our trailer so the driver would not move and they called police while we tried to negotiate with management. This is a very very poor service and to lie like this to cover your people is not professional and affects your business, because companies and drivers talk. Do not use this service. We all in the same business and scam companies and drivers on the road shows how you do business in your shop.