Double billed then subscription was stopped when bank reimbursed one payment

Was double billed for office 365 , called and emailed microsoft with no body able to assist. Phoned my bank and sent mail and eventually after 3 months i was reimbursed one payment. Then microsoft cancelled my subscription a month latter Tried on numerous occasions to resolve the issue with microsoft either telephonically or with online chat with the promise that a manager will contact me to resolve but has never happened. I will try contact my bank to refund second time to the full amount of double payment but will probably be hard as alot of time has elapsed since the dispute.