Ebucks not for me!

I find FNB Ebucks totally useless to me. 90% Of my transaction’s are via my FNB credit card. I contacted FNB to get them to close the Ebucks account and they came back to me to say that they can’t close the account because there is a whole 413 Ebucks in the account and would I not like to use the balance as a donation. This did not work as the min donation was R50.00 and I only had R41.30. I really don’t want this account how do I get FNB to close the account?