Urgent tenancy help required please?

Hi I moved into temp accommodation in Nov 2019 (self catering holiday home) as waiting to purchase a house. House purchase fell through and had to look for new place (due to move mid July).

The owner of the holiday home changed the use of the property to a normal tenancy from the 1st April and I’m now responsible for council tax.

The owners have now said that property has been sold and I need to move out this next week. Where do I stand?

There is no written tenancy agreement just a text message saying that from 1st April rent will be xxx and council tax is now in my name. No end of actual tenancy as was waiting for move in date for new house.

I can’t move to a new place and take a 6 month tenancy elsewhere as moving to new house in about 3 weeks.

What’s the best way to sort this?

Many thanks

Jane