Never received section 21

My landlord sent me a letter on the 28th May saying my tenancy comes to an end on the 17th June and therefore someone would be coming to do a checkout.

I was totally shocked as I have been living at the property for 3 years and have always paid my rent in advance. I was expecting a new tenancy agreement as my tenancy runs out on the 11th June.

When I contacted the letting agent saying they couldnt just give me notice of 18 days I was told a section 21 had been served on me on the 15th April and it had been hand delivered. I explained I had not received any such notice and as I have CCTV I asked what time it had been delivered. I had the CCTV checked it and no way had the notice been put in the door!

The reply I got was how do you expect me to remember something I did two months ago.

I’m wondering is there anything I can do as I just cannot find somewhere suitable in 18 days.

I think the are doing it as I complained about a few repairs after the flat was burgled at Christmas and it took them 4 months to come and fix the broken windows and doors.

Thanks

Karen