Please post-up the first PCN, and then tabulate all PCNs with PCN Number, PCN Date, and Date of receipt.
Essentially there are two things to be established, (1) did the offences occur at all, and (2), how many PCNs were outstanding when you received the first one that alerted you to the offence.
At the moment, we know nothing about why the PCN was served, so need to check the PCN and the location signs, plus your approach route to them.
Then we need to assess the best option to get the subsequent PCNs cancelled. Clearly it is a huge penalty for something you weren't aware of until the first PCN turned up. Councils have a public duty to act fairly and expeditiously, and to be honest many will recognise the problem, and cancel some of the PCNs provided one is paid.
Of course investigation may show the signs are indequate or badly place, although I suspect it was your ignorance of their meaning that has got you into this situation.
So please do as requested and also post a GSV link to the location, telling us your approach to the signs.
Bear up as all may not be lost, although my feeling is you are going to have to pay one PCN at least but wait and see what the others say.
