Poor service

On the 8th of April I did a quotation with Bakers hardware on the 18th I went back to the same email address to confirm if I can still pay because I need material to be delivered this week they responded and said yes you can proceed this is our account number and send proof of payment when you done today I went to pay only to find out its not their account number FNB assisted me to block the account same time but the hardware is telling me that they are sorry their email was hacked and I must pay another amount and full amount it is not their fault I must speak with fnb tell them to refund me I don't understand as a customer how is it my problem if their account and emails was hacked because I did not receive new email I responded on the same conversation we have been communicating on and I got a reply on the same email address the service is very poor I'm so disappointed