Best answer by Jon1
All you have to do is from the homepage,tap on 3 bars top right, tap on help, tap on wattbot. Type:- message the team. Then type asking for your DD to be reduced to £x amount. (Whatever you feel is needed) explain why you wish to change it, it may be obvious to you but better to be polite as whoever answers cannot see what you see.
Its not live chat but you will get a response within 1 working day. So check back with wattbot to see the response.
Last time i did it all was done and dusted within 4 hours.