Time travel

I will be at some point in my future a time traveller. I have not gone back in time just yet, though at this moment I am going forward along with everyone else. Why am I going back in time? It is the only explanation I have for meeting people who say they have met me before. Such as those really nice calls I get from people who are selling me stuff.
"Hello Mr CH we called earlier about our go faster widget wiper time sharer and you asked us to call back another time"
"I did?"
Well all I can say is that either I am going senile and forgetting so much stuff nowadays, or I am travelling back in time taking those calls and re-arranging them. God I am a C$%T to myself.

Of course one begs the question why am I going back in time. Perhaps I really do need to make those purchases to prevent the world from ending, or some rightwing politician from invading other countries, imprisoning people without trial and say things like "The relations with, uhh — Europe are important relations, and they've, uhh — because, we do share values. And, they're universal values, they're not American values or, you know — European values, they're universal values. And those values — uhh — being universal, ought to be applied everywhere.

Oh shit. I knew I should have purchased that double-glazing.