They charge €6 per quarter unless you keep €2000 in your account.
As you were on the 4.05% rate and if you put that €2000 onto your mortgage you'd have been saving €6.75 per month rather than €6 per quarter.
UlsterBank give you free banking if you keep €3000 in your account. (
http://digital.ulsterbank.ie/person...=I_PPC_GGL_MTA_MTAGen_AO_CURACC_1#waiver.html)
For me when I left KBC mortgages I closed my Current Account straight away. They're the same bank as that that was ripping me off for the mortgage so I didn't want to be their customer in any way anymore.
Moving direct debits is a pain in the hole alright but not too major. I'd recommend you do it yourself rather than rely on "switching teams" if they still have those.