Unprofessional and rude

Have had a change in my banking details, so debit order details changed, I did manual efts and had no issue, until I contacted them to change the details, I CONTACTED THEM, after a 3 day runaraound, sayung they coukd not change the details, I gave up, and essentially stated that it was ok, but if another debit order bounced after I had informed them of the situation, and made the efforts to correct the details, that I would not be making eft payments, I suddenly received acknowledgement that they had managed to change the details! Now I find, trying to use my account to make a purchase, that it is suspended, despite another email from them stating that they confirm receipt of my payments and account is fine?! I have made FIVE requests for contact, since Sunday, and have not being contacted! To summarise, I contacted THEM to make sure they get paid, they made it complicated, bad businness, now they ignore me like a sulky child, bad manners!