They don't help you.

1. You are not helped by them.
2. You were not helped by them.
3. You are not being helped by them.
4. You should not be helped by them.

Converting simple present negative active to passive: object (you) becomes subject + are + not + past participle (helped) + agent (by them). Simple present passive negative maintains the negative “not” after the auxiliary. This form indicates that help is not provided as a general practice or current situation. The focus shifts from those who don’t help to the recipient who doesn’t receive help.