Recurring Bill not showing on Microsoft - purchased at Currys

I purchased a separate Office 365 package from Currys with a laptop at the beginning of this year. They provided me with a letter and a recurring payment reference and told me I would be able to turn off the recurring bill at any time. I have spent months and months speaking to Curry's telling them that I do not have a recurring bill button on my microsoft account and they said I need to speak directly to Microsoft (whose telephone number does not work). I can see clearly that it states if you purchased through a third party you need to go to them, but Curry's keep sending me back to Microsoft, even after several calls, visits and complaints. Any ideas how I can ensure the recurring payment is not taken when it is due for renewal? It seems to me a bit of malpractice on the part of Currys? Just wondered if anybody else had experienced this and knows what can be done? Many thanks.