Hi and welcome to JA. Ray here to help you.
You are a month to month tenant.The landlord can give you a 30 day notice to leave and then evict you.You aren't in violation of anything , their letter is factually incorrect.
You would at a minimum get 30 days notice of termination here and the right to leave.The thing you have to watch out for is you are obligated to give them 30 days notice here too as a month to month tenant.As long as you do that you would be fine here.
They cannot force you into a lease.They can give you the 30 days, they can raise the rent too since you do not have a lease.But they cannot evict you with less than this proper notice.They are harassing you here, that should cease.You have the right to stay here as a month to month tenant until they notice you otherwise.
Again you are not in violation of anything here, all they can do is give you 30 days notice if they want you to leave.That has to be in writing and delivered to you here.Until that happens you can stay as you are.
I am so sorry they are hassling you this way.You may decide to let thing ride as they are here for awhile, legally you are not in violation of month to month tenancy, and they cannot threaten you otherwise.
I appreciate the chance to help you today.Please let me know if you have more follow up.Thanks again.