Is your account syncing isth QB file? Can you check the date and time stamp for Full Sync and Changes only Sync under Quickbooks > Synchronize.
If it is not showing the current date and time, make sure your Qb file and Method engine is up and running and then run a full sync.
If it si showing current date and time on the sync page then;
Can you please let me know what is the name of that customer. Also, can you turn on Method support user on your account. Once the method support user is On, I can look into your account.
In order to turn on Method support user for your account follow these steps :
Go to Customize tab > Users > Method Support(Last user in the list)> click on the checkbox and make it checked.
Once you finish that make sure there is a right check in the checkbox in front of Method support user.
-Inder