MICROSOFT 365 - PATHETICE SERVICE

I subscribed for Microsoft office 365 Business on my personal name and have been trying unsuccessfully for more than 2 months to cancel the subscription. Pathetically I have been to put through to several international call centres with no success and Microsoft in Johannesburg just shrug their shoulders. In the meantime Microsoft keeps on billing me. It s extremely frustrating and appears that once they get access to your money its just about impossible to access them to cancel anything. This is poor customer service as I helplessly watch my bank account shrink. Is there anybody out there that can help!