Unfair Payments

I need help with this company I have a payment agreement with them as they represent Bridge Loans we set up a debit order of 488 per month. According to my statements and bank account I should be up to date with payments. They first said I didn't pay for March 2022 of which I did. I sent proof of payment this was never rectified everytime I call I speak to a different person. The supervisor at the call centre named Lorna promised to get back to me but never did everytime I call and ask for her she tells them they must say she's not available. This morning the duducted double the amount they suppose to deduct. Please any advice I do not know what to do anymore this is ****************