Defaulting tenant & severe damage

Walked into my property after trying to evict the tenant several times. To inspect the property in the first instance was traumatic.
"Im going to replace the broken glass door, replace the missing bathroom door, ripped wallpaper & missing carpet just give me 6 months.
The house stank of urine, I thought this was something to do with a large caged guinea-pig not being cleaned out.
“6 weeks maximum to right the wrongs” No problem he said.
6 weeks later, he was on holiday, or in hospital & I couldn’t get into my house.
He eventually agreed to leave & found a new rental.
He left because the smell & flies would’ve been unbearable.
Carpets ripped out, laminate floor pulled up all sodden with urine.
In the overgrown garden rubbish is everywhere & the filthy cage of the animal that was in the spare room as I dismantled the cage the smell got stronger to reveal the dead animal.
My doors & frames gnawed, its an exhaustive list.
Tradesmen refused to go upstairs due to the smell. Faeces on the carpet & walls.
The neighbour came round & pleaded that he’d gone. She said whenever I came round the dogs went off in a car. They were left on there own alot & howled day & night.
She said things were so bad she contacted OpenRent for my number stressing how important it was but they told her it was nothing to do with them.
My advertising, tenancy, vetting of tenant & guarantor was done via OpenRent.
I emailed a few times & asked about the neighbours contact. No explanation. I wanted to know where I stood with the guarantor & the defaulted 1 month rent. No information given apart from contact Landlord Law.
Feel like a tenancy isn’t worth the paper it’s written on & amazed that when I Google for help & advice it’s 99% about assistance for tenants against Landlords.

fix it up and sell, not to another landlord So that we have reduced private rentals to stitch up people like that and the L A who side with them