In short, we had carpets installed 3+ years ago at the end of a huge extension. I am sure we paid everything but had a call from the supplier yesterday saying their credit caller found a discrepancy and thinks the payment might not have been made. They are checking their records to see if it's misfiled but for me to prove we paid will be a huge headache requesting old credit card statements, trying (and failing) to find old cheque stubs etc etc. Does anyone know where we stand? For the record it would be extremely out of character for us to not pay a bill and we would definitely have noticed. But that's not proof of anything....