Parking fine CP PLUS

[Mattmurphy]

Hi all I recieved a parking fine today from cp plus that states this is the 2nd reminder off them they state they first sent a notice out on 16/10/2019 and a reminder on the 4/11/2019 and then today's dated 21/11/2019 , the one I received today on the 25/11/2019 is the 1st one I have had off them I haven't had any others on the previous dates stated. It says I now have to pay £140 for 29 minutes parking over the allotted free parking. I was driving down to Manchester from Scotland and started to get a migraine and was tired so came off at birch services westbound. I set my alarm for an hour and 45 minutes but overslept due to the migraine when I woke up my head was still hurting and I didnt realise I had gone over but set off again immediately. What can I do? Thank you