Free Traffic Legal Advice

I parked at a site in Lincoln on the 17/11/25 and selected the night fee of £3 to park and swiped my card to pay. However, when the ticket printed I had been charged £9 for 24 hours.
I phoned their helpline and was advised there was nothing they could do, I just needed to email them as a company.
I have now sent 4 emails to the company (no response) and despite speaking to someone in their customer service department who advised someone would phone me back, I am still waiting.
Any advice on how to claim the £6 back.  to goto Small Claims Court is £35 which I feel I may have to use.
It is the principle as if it was the other way around, I am sure the fee would have risen by now and court papers served.

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