It's sad to see a Sr. member behaving this way and for a small amount like $3. I would advise you to just wait a day more to see if he pays as I don't think he would risk his account for this amount as if he sells it, he could get more BTC.
What's so hype about a senior member ? Buying accounts is allowed so mostly a newbie who knows nothing about this forum,can easily get a senior member account.Moreover Mrai is a shitty service people are doing for few bucks,there are no escrows ,no middlemen involved with the payments.Members blindly do the job without any guarantee of the pay.Its not completely the payees fault but the OP's fault too for doing tasks with riskful payments.