PPI claims company threatening court action

Hi, pretty new to all this so go easy on me!
I naively filled out some PPI/bank charges claim online ages ago, gave all info I had to hand. “Electronically” signed all documents. Was sent something in the post which was lengthy, eventually completed & returned.

Cut a long story short but I started getting A LOT of emails from this company. Regarding all sorts of things, claims against pay day loans, claims against all sorts of things, there was that much I lost track. I work, single parent, carer to sick relative - not really relevant but like many others I’m busy constantly and despite the stigma surrounding these companies it seemed, at the time like a stress free option.

I was only ever really interested in PPI/bank charges and I assumed everything I filled in was to do with these. I got a final response saying once they’ve checked my credit history there’s only two companies out of about 12 (I think) I could claim against - one being a mail order company (which at the time I owed a mere £80 (left to pay, now paid!) and the other being my current account, which at the time was overdrawn) I basically replied saying I didn’t really see the point in perusing a claim against these for the reasons above. To which they agreed.

I then started getting emails regarding some payday loan I took out a while back, (I know! Please don’t judge me !!!128553;!) asking me to send them a copy of some letter. I had no idea what they were talking about and told them this, on top of the fact my balance was zero I didn’t understand why they were even looking into it.

Fast forward a few weeks and they’re now saying I’ve breached the contract and that i’m Liable for cancellation fee’s of £360 for each company they originally persued (as said above, sure there’s about 12 all together)

The guy who was emailing me was horrible, very threatening, making out like I was lying, saying they’ve now realised I’ve breached the contract for a second time as I’d not returned documents (this isn’t the case - I’ve returned everything I’ve received)

I was getting no where with him, he was awful, extremely threatening and it just snowballed, the more I tried to get to the bottom of it, the more he threatened & I (stupidly?! Not sure!) ended up leaving a lengthy yet honest review on trust pilot to which he replied (privately) saying if I didn’t remove it they’d sue me for damages, costs etc. Cut a long story short he reckons he’s issuing court proceedings first thing tomorrow.

He’s literally not left me alone all night, threatening all sorts, telling me I am liable for court costs on top of the damages and fee’s already mentioned.

Apologies for any spelling errors, currently in the middle of something & frantically trying to explain myself via text on my phone!

Any advice greatly appreciated!