If unexpected error i.e Error 502 is creating problem again and again in your account and you are not able to open your account and because of that your work is getting delayed. There is no need to get worried about it because we have a team of highly qualified and experienced professionals with us. Who will guide you with proper and best ways of solving this. To  grant gmail customer care service regarding error 502 then call on +1-800-778-9936 our toll free number or visit http://www.email-supporthelp.com/gmail-support-number.html