Unwanted protection I allegedly purchased

AVG just emailed me advising me to activate 'AVG Tuneup'.which they say I have already paid for.
I do not recollect purchasing it. How do I find out when I allegedly did so and how much money they took from me?
If I did purchase it, this was by mistake, and possibly due to a wrong click on their web site.
I do not wish to have this product and I shall not activate it. How do I get AVG to refund any money they have taken?

Hello, 

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