Like a lot of organisations in Spain, their Banks are somewhat dodgy and always trying it on with customer charges, rather like many of those agents, developers and lawyers in the boom days 😆
We opened an account with Solbank, had a large credit with them and every month they tried it on with punitive charges which we always had to fight to get cancelled out. Exhorbitant process charges, even receiving of monies from UK, worse charges to send monies back, charges for breathing or smiling, you name it they charged for it. Needless to say we were mightily relieved to get all our funds out of Spain with profit thankfully, and back to the UK’s slightly less dodgy Banks. 🙄