Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Question.. When you bought office 365.. Is there any other email you may have possibly used at the time?
Hello again.Did you still need help with this issue? If so, please respond so we can get started.Otherwise, if you want to cancel this support ticket, please respond and let us know so that we know to close this ticket out. Thank you,Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.