They have sent me no letters to date apart from now a court form letter indicated that i have to pay £300+.
Have you changed address between the incident in question and now? For you to have received absolutely no communication prior to the court claim requires quite a few letters to have gone missing.
They have also got my name wrong on the letter as i changed it over 2 years ago
Presumably the name they have used is your name as it was on the vehicle's V5C on the date of the parking incident? If so, no mileage in this.
Now that you've got a Claim Form, you should have a look through the MSE Newbies thread here:
https://forums.moneysavingexpert.com/discussion/comment/64350585/#Comment_64350585 - this explains the process start to finish, your first step with the claim form will be to acknowledge service to give you the maximum time to file your defence.
You should urgently send a
Subject Access Request to MET Parking. Attach some documents to verify your ID, a redacted utility bill and a redacted copy of your V5C would be good examples. Also provide any prior address that may have been on the letters originally. Bear in mind you may not receive a response in time for your defence.
In terms of your defence, there's a template on MSE that you might be able to use as a starting point - I'm not a huge fan of using a template for a defence, because there's a fair chance the judge will have seen it before, but without any information on which to base your defence it's a starting point.
A couple of other things. You should make clear through the defence/witness statements that you received no correspondence about this - you don't want the court to think that you have simply ignored MET Parking, as this could make you look unreasonable.
I can't see a good reason why they have taken this long to raise a claim - you should draw attention to this, whilst it is within the 6 year limit, you could argue that it is unreasonable for them to wait so long, and that there was no good reason for them to do so. At the very least, you should challenge the addition of interest - they've added nearly 6 years worth of interest onto the claim. Given that the tardiness in bringing the claim is at least in part down to them, you should challenge this.
I note the initial charge is £170 - this means they have added on £70 in spurious 'debt collection' charges. You should also challenge these, the courts routinely throw these charges out as they are an attempt at double recovery (the £100 charge covers them).