I have heard of this happening in another state with another type of state program, telling them to cancel their Part B. The only thing that they could do was wait for the open enrollment to get reenrolled in Part B. In your case you are lucky in that is not as far off as his was; he found out in February and had to wait a year and half before they could reenroll. He did get it back though then.
I am so sorry that you were given this bad information about dropping part B and that others are being told this as well. Perhaps by sharing this, it will help prevent others for falling into the same situation. Hang in there meanwhile.