I don't know what you can do now that the new glass has already been put in. There are many reasons why you should only go with OEM Mercedes Glass.
But most importantly... your windshield is part of your car's structural integrity... I would be sure it is Mercedes glass!
Do a search and you should come up with a fair amount of info, and then you can more accurately decide how to handle your situation.
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)