Possible GDPR violation of banco sabadell in Spain, how to report?

So I am a Swedish citizen living in Spain with residencia. I am self employed as autonomo here. Banking in Spain is a bloody nightmare, extortionary fees and stacks of paperwork to name a few issues. I had to use Sabadell when i didn't had my residencia/work-permit. I am planning to move now but a lot to do.

in the past 12-6 months or so the app they are using have been pushing for moving from their own system of …

gdpr privacy report spain