From their T&Cs :
"The bonus may not be combined with any other bonus unless stated otherwise.
In the interest of fair gaming, wagering requirements are 12x (times) your deposit plus play bonus before cashing out any amount higher than your initial deposit amount.
Bets placed on all forms of Roulette,
Black Jack Surrender or Black Jack Multihand do not count towards the wagering requirements (these games have their own coupon bonus offer). "
So like stated in our review classic BJ should be allowed as they only refer to BJ Surrender and BJ Multihand and their variations. I suggest you to contact support and quote them the terms.
http://www.7spins.com/promotions.html