Can nobody help?

Hi, it's my first time posting here. My Landlord is a corporate company that rents out hundreds of flats. After two years of being a good tenant and always paying on time, my (now ex) partner stole money from me and I fell into two months rent arrears. My Landlord was not willing to agree to a payment arrangement and instead served me with a Section 8 Notice and a Section 21 Notice. Both those notices have now expired. They seem to have ditched the Section 8 entirely, but I just received the court paperwork for the Section 21 Accelerated Possession. Now, the Issue Date stamped on the court paperwork is 11th June. But the postmark on the envelope it came in is 22nd June, and it only arrived in today's post. It says I have to send in my Defence "within 14 days". Does that mean within 14 days of the Issue Date? Or within 14 days of them actually posting it/me receiving it? The Landlord's told a few lies on the form. They claim they issued me with a How To Rent booklet and an Electricity Safety Certificate on a specific date. It's not true at all - they never provided these things. And the date they've claimed they issued these items on I was not even their tenant and they'd never heard of me. Further, the Landlord had finally entered into a verbal agreement with me to let me stay as long as I started clearing the arrears (which I've been doing). Then the court paperwork arrived out of the blue. The Landlord's now denying they offered to let me stay. This leaves me with something like 14 days to find a new place to live, pack up and vacate. I am 7.5 months pregnant, ill with PTSD (due to the domestic abuse) and I have no spare cash for a deposit for a new place. Is it worth filing a defence? I've tried calling the court but they don't pick up their phone, ever. I've no idea what to do. I'm terrified I will lose my baby if the stress doesn't stop.