Cancellation of line instead of prepaid migration

Where do i begin? The worst experiences i've ever had with a service provider. I have my cellphone number for 12 years, i've been thru many contracts, never in my life have i heard of a service provider DEACTIVATING a line when a contract is over, the person cancelling my contract in store clearly stated that my number be migrated to prepaid, yet some ****** at autopage who doesn't know their A** from their head decides to deactivate my line. Now i have no phone line with all my banking OTP's and business calls usually coming to that number for 4 days, i reported it on Monday, they said it will be sorted out in 24 hours, it is now Wednesday 5pm, WHAT THE HELL DO I DO? I cannot make online banking transfers, purchases, i cannot receive important correspondence calls. Why oh why would any freaking Network deactivate your line when your contract is expiring????