Questions, concerns and complaints. To share your concerns, suggestions or experience with any Main Line Health hospital, please contact our Patient Relations Department by calling: 1.484.337.2662.You or your representative can also file by mail by sending your written grievance to Regulatory Department, Gerhard Building, 130 South Bryn Mawr Avenue, Bryn Mawr, PA 19010, fax to 1.484.337.2013 ....