What to do now with offer from ‘BidVertiser’?

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Once upon a time, I used ‘BidVertiser’ for a couple of days for my blog but no money was accrued to my account and so I switched over to ‘Adbrite’ where some money has already been credited to my account, though the amount is too small to be mentioned and is far away from the minimum payout. But what makes me puzzled and hence anxious is that ‘BidVertiser’ is still now in the process of sending me emails for claiming my ‘BidVertiser’ coupon of $ 20. I hereby quote the message in part that has been sent to me recently: “We have noticed that you have not been using your BidVertiser account so far. We are writing to encourage you to advertise with us, and we are so confident that BidVertiser will work well for you that we will add to your account $20 in clicks! In order to get your $20 Free Credit, simply login to your account and click "Activate Account".” I am in a fix as to whether to claim it or not because I joined ‘BidVertiser’ as a ‘publisher’ and not as an ‘advertiser’ and hence seek your kind advice under such circumstances. It may be so that they have committed a mistake by treating me as an ‘advertiser’ and not as a ‘publisher’. So what I need to do now?