Advice on the internet is to ignore completely if you were in a free car park monitored by one of these parking companies. Do not appeal or contact them in any way as this only adds fuel to their fire and they will pester you even more.
Most people have only had 3 letters from them.
If you should have paid some more money then it is a different matter and you could offer to pay them the outstanding amount "in full and final settlement". (make sure you keep copies of cheque and all documents).
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You cannot download files in this forum