its common practice for insurance to have a "total coverage" contract with a provider, so they say 876 is coming out of next month's insurance check to you, and the difference is between you and these clients... or you can eat it.
No cash ever flows back to the insurance company from a provider.
Once I got a quote from one of the doorstep fliers. The guy defrauded me between 54% and 30% of the original contract price because he waited until he got half up front before saying he would do a job with crappy materials that would only last a year or so unless i paid 54% more. I should have cancelled the check and said get off my property.