Dropped off camper @ service center, explained problem with crank, while there they asked if anything else we wanted checked we mentioned wheel bearings and link in sink,They phoned with price for bearings and sink asked if we wanted them to fix while they were getting price for parts on crank we said no wait, following day i called they gave me quoted price for crank and 2.5 hrs of labor total of 512.50 plus tax, asked if I wanted them to order parts as they did not have in stock said yes order parts asked them again price said same thing, told them to just do that, nothing else...We went to pick up camper they charged us 6 hrs labor plus fixed sink and did bearings now bill is over 1200.00, we did not authorize this work and remainder hrs in labor what are our rights

please help