St John in Guernsey is pleading with islanders to pay for their ambulance journeys.
In Guernsey, ambulances are not free and while part of the cost is covered by the States, the charity relies on subscription fees or charges.
There are more than 50 outstanding payments that are at least six months old.
Stuart Brennan, the St John Chief Financial Officer, said they may have to take people to court if they do not pay.
The charity claims they have written to those who owe money three times, as well as offering an installment pay back plan.
Anyone with a genuine reason to not pay back is being asked to contact them.
St John offers an annual subscription fee, meaning islanders can get an emergency ambulance for free.