Sales data and customer data of a complete month is missing.

We recently started using QB online and added a whole month of sales and customer data for July. All this data appeared correct in sales which seems to have now vanished. Existing invoice numbers are all sequential, no numbers seem to be missing. Expense data is still there. I am clueless. Checked Audit reports for deleted items but its all clean. Checked chart of accounts also no data for July.