When you have a problem with the services you are receiving from DDA, often the first person to call or email is your DDA Case Manager. They may not respond immediately, but you can expect them to call or email you back within a day or two. Keep speaking up about your problem until it is solved.
For more tips on resolving complaints, listen to what the DD Ombuds Advisory Committee Members have to say: https://ddombuds.org/videos/