"You should have noticed in 2017 when we started this process to begin with" (would that have helped, complaining at the time?)
"We're confident we're not at a competitive disadvantage by doing this"
"We developed our product " (to remain competitive) " and had to add a bunch of stuff that people expect card processing services to do " (more than one currency) " and some stuff many customers won't care about being delivered by a card processing service " (things other than cards) " and rather than charge the appropriate fees to the appropriate customers at point of use we are instead funding this progress by penalising customers who are already in the loss-making situation of having to make a refund"
"You should have noticed in 2017 when we started this process to begin with" (would that have helped, complaining at the time?)
"We're confident we're not at a competitive disadvantage by doing this"
"We developed our product " (to remain competitive) " and had to add a bunch of stuff that people expect card processing services to do " (more than one currency) " and some stuff many customers won't care about being delivered by a card processing service " (things other than cards) " and rather than charge the appropriate fees to the appropriate customers at point of use we are instead funding this progress by penalising customers who are already in the loss-making situation of having to make a refund"