Geico insurance Don't want to pay to repair customers car proper Internet, California

As a body shop owner I 'm tired of the arguments that geico  has, simply not to pay us to repair  our customers cars.

Inferior parts, used parts, low labor rates or simply saying we don't pay for a procedure needed to do the job Right, cutting corners or writing incomplete or low estimates.
   They have shops that will work for a lower rate regardless of quality,   just to save them money.
They want to dictate us how much to charge,  Do we have the chance to dictate how much to pay for their coverage ????  of course  NOT  the policy holders that has not file a claim have no idea how hard it is for them to pay.  We body shop owner see it often and it is not good for us or the customers.