Advancebet is a bonus feature which is available if you have unsettled bets on your account. Advancebet is not a credit facility.
Advancebet provides you with the facility to place further bets when you have insufficient account balance, based on an evaluation of the potential outcome of your unsettled bets.
If the Advancebet amount used to place bets is higher than the amount you subsequently receive from any bet settlement within 48 hours, Marathonbet will absorb all liability for that amount. This means that you will not have any obligation to pay back the remainder of the Advancebet stake you have used to place bets.