Discrepancy Regarding My Account.

I have been struggling with Impact Meters for 3 months.They have been sending me Statements which is incorrect.I keep on sending them Proof of payment with the CORRECT ref.number,which doesn't help!Now all of a sudden they want Bank Statements,to which I haven't got access at the moment,I demand that this problem gets resolved today,as it is a mistake on their side,and I feel it is very unprofessional of them to cause me the extra effort to sort this out!!!!