An order with extra service was cancelled by mutual agreement, how do I get paid for the extra service that was also supplied?

An order with extra service was cancelled by mutual agreement, how do I get paid for the extra service that was also supplied?

An order with extra gig was cancelled by mutual agreement, how do I get paid for the extra gig that was also supplied? The main gig was $25 the extra gig was $15, when the order was cancelled the buyer was refunded the whole $25 even when only the $25 gig was cancelled. How do I get the $15 back since I supplied the extra gig with the main gig?