Put in a formal complaint about their discrimination/ignorance (by registered post), if their reply is not acceptable raise it further.
Take an audio recording of all meetings with them (phone or in person) to aid your case if necessary.
Quote:
You'll get a reputation as a difficult person and they'll make things difficult for you in retaliation.
I was in the "fortunate" position that I can make it difficult for them without financial consequences (income from lodgers reduced my benefit to a very low amount).