It's unfortunate that you had to shell out $$$$ to have someone fix it for you, because for most MB models, it's a relatively inexpensive and simple fix, and can be done in an hour's time.

Even if you had to replace entire power window assemblies, you are only out about $150-$200 max.

In many cases, there is a $2 part that remedies the problem!!!

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car