London - The TSB mistakenly sent a customer a letter declaring her bank account overdrawn by £121 billion, it emerged yesterday. Aerobics instructor, Ms Liz Seymour (24) found the letter from the TSB waiting for her when she returned to her home in Hull from a week's holiday in Gran Canaria, according to the Sun. Ms Seymour contacted her branch who have now "resolved" the matter and are to send her a revised statement.