We just installed Glacier Bay sinks and the stoppers won't stop the water from leaking out.

What to do? Can't find a phone number for the company.

Did you seal sink drain flange with plumbers putty?

Glacier Bay is a storebrand name made for Home Depot so you can start with them. Try to answer Harold's question, is the leak between the stopper and the sink or is it the drain not sealed to the sink? http://www.homedepot.com/Bath-Bathroom-Sinks-Pedestal-Basin/Glacier-Bay/h_d1/N-5yc1vZari4Zn7/h_d2/Navigation?langId=-1&storeId=10051&catalogId=10053&Nu=P_PARENT_ID&omni=b_Glacier%20Bay

I believe that Glacier Bay sinks are made by Globe Union, http://globeunion.com/page.php?key=customer , for Home Depot. So give Home Depot a call.

Alternatively you could simply call the vendor who sold the sinks to you.