Being threatened with LEGAL ACTION!

I opened an account in March, end of the month's payment was not deducted via debit order. April's payment was also not deducted and I was SMS'd that my account was in arrears. So I called customer services yesterday 11th May to query and was told that I had given an incorrect account number on my application form and that was why the installments had not been deducted. At 4h30 this morning I get an SMS which reads\ PAYMENT ON YOUR GAME ACCOUNT IS 2 MONTHS IN ARREARS. YOU ARE NOW IN BREACH OF YOUR AGREEMENT. PAY TODAY TO AVOID LEGAL ACTION". I HEREBY CHALLENGE THE ACCOUNTS DEPT. TO PRODUCE THE APPLICATION FORM ON WHICH I ALLEDGEDLY WROTE THE WRONG NUMBER! Why should I be threatened with LEGAL ACTION when some sight-impaired"