Houston Alternators & Starters

This company installed an upgraded an expensive upgraded alternator to my *** sprinterThey forgot to install bolts back into the turbo causing a loss of power to my Diesel engineThe sprinter specialist has explained that these where clearly not replacedHouston alternators and starters refuses to accept the fact that they made a mistake
I've spoken to them countless times about this issue and they have no regard for customer service and just refuse to help for a mistake made by them