My question involves landlord-tenant law in the State of: Missouri

Long Story Short
I am moving to Missouri and could not be there in person. I was emailed a lease and signed my end 2 months ago. I signed in blue ink and sent them a black and white copy (so they know my copy is original if anything happens). I emailed them 5 times over the last month to get a copy of the lease signed by the manager/owner. For one reason or another they still cannot give it to me.
Move in day is just over a week away.

What are my options?

Do they have a timeline to sign the lease before it become invalid?

Do or am I held hostage. They can void the lease whenever they want by not signing it or sign it whenever they want?

Thank you so much I am in desperate need.