There is a list of merchants that are known to have issues accepting Mondo at the top of the Known issues/ bugs thread. From the looks of it, some merchants block prepaid cards, which is probabaly what EDF are doing.
There is a list of merchants that are known to have issues accepting Mondo at the top of the Known issues/ bugs thread. From the looks of it, some merchants block prepaid cards, which is probabaly what EDF are doing.