If you booked the rooms and a member of your wedding party or a guest damaged the hotel, you are most likely responsible for the cost: while you need to check the room agreement or contract to be sure, generally, they require the person booking the rooms to pay for all damage. Since you can't recover compensation for what they tried to do but failed--e.g. if (for example) they actually took $1,000, that's all you could potentially sue for, not the $7,450 they "tr[ied] to take"--it may not be worth suing: yes, they should not have debited without permission, but 1) the contract/agreement may have given them authority to do this (again, you need to review the contract and see what you agreed to), and 2) even if they did not have authority, if you sue them the (for example) $1,000, they could likely countersue for the full amount of the damage, which may be higher.  You maybe best off getting the "person that was with our group" who damaged the sprinkler to pay some or all of the cost, since even if you are responsible to the hotel, if he caused you to lose money, he would likely be responsible in turn to you.