The call on the flop makes no sense. If you plan to continue with the hand, you have to raise. You ended up calling 7.50 on the flop and turn combined with no chance of winning the hand. If you raised to 6 on the flop, you beat his bluffs and shut him down on the turn unless he has an ace for sure. Regardless, you save 1.50 by raising to 6 on the flop. Even if you hit a 9 on the river, can you call a big bet with the underfull? Calling can't win this hand against an opponent who will continue to bet at you.