Incorrect booking doesn't get fixed!

A booked flight had the incorrect return flight date registered - reading July in stead of August. Despite me forwarding the confirmation e-mail, as received, with the correct date of August and phoning they still refused to fix the error. <br> <br> After launching a 'web enquiry' i receive two low resolution screen shots that the ticket is booked for July, which i already know - stating it as proof that the booking is correct.<br> <br> Phone and e-mail service is fast and corteous, but frustrating, just hitting the same wall each time with someone telling me - the investigation has already been performed, would i like to shift my flight.<br> <br>