Some answers please

I have been receiving emails from Avios for a few weeks that I have just deleted without reading as I thought it was spam. Today I thought I would have a look at the mail to find the unsubscribe button and see that I have been registered by them and have a membership number???<br> I do not recall signing up for this and I would like to know where and when this happened. I do not travel so I cannot see myself signing up for this.<br> Please could someone get in touch via email and tell me how it can to be that I am all of a sudden an Avios member?