Staff member unable to assist with voucher payment

On the 16 May 2015 I decided to spend my Wakaberry voucher at the Oakfields Wakaberry that I had received as a gift a month prior to that.<br> <br> The whole reason I had driven to the Oakfiled centre was so that I could spend my voucher. As I was ready to pay not one of the staff members on duty was able to assist me with paying with a \wakaberry voucher"";but I just feel that this is completely unacceptable as I would not have driven all the way there if I had known I would have to pay cash. <br> <br> Surely it is a given that all staff members working in whichever service industry should know how to operate whichever payment methods?<br> """