Thats bad service. I had an issue when I purchased 3 x Mitsubishi commercials vehicles. They were only doing 10MPG for a 2.8TD engine. I found out that the differentials were wrong. They said I would have to payfor the up grade. I said I would have graphics on the side of all 3 trucks saying "do not buy these trucks as they are rubbish, give crap fuel economy and back up service is awful" and drive them around the city if london. I even cut and pasted the word on a photo and e:mailed them what I would do if they did not pay the total costs.
Guess what the result was!
Guess what the result was!