Hey Joereynolds89,
The technical team will be able to perform DLM resets, however it may not be something that many are aware of as it doesn't come up frequently - the call would most likely need to be passed to second line who can get this arranged. I can have Ryan (who is a BT employee) have a look at the thread in order to have this sorted out, he doesn't return until next week however.
In the meantime, it may be best to have an engineer out if you haven't had one already to run through some further network checks. If a fault or errors on the line have effected the DLM profile and this isn't fixed, it's likely the profile will just degrade again over time and the same issue will reoccur.
Thank you, Bobby