They are sausages !! I ask for the form to settle ...

They are sausages !! I ask for the form to settle the debt and I make the transfer of the amount that it puts and apart I pay a receipt with a surcharge supposedly returned. The debt is settled.
Well, now, they have left me to pay another 31 euros that they do not even know what they are ... I send them an email with proof of payment and transfer and they tell me that nothing came to them. In short, I have to pay those 31 euros for my face.
I will not finance anything with them again ..