If you were to sue and this is a on going probelm you could join lawsuits with many other ppl giving you more power and Jagex will shurly fall with all that prove. (Assuming you are telling the truth and Jagex is in the wrong) Or mabey ask if they have a fax or something were your bank could directly fax them profe of the payment. I realy dont know if that fax thing would even be possible as they probably wouldent give you the number.