Very strange management here

Peak period penalisation

During the holiday season, effective from November 4th, 2019 until January 10th, 2020 these parcels will also incur an additional temporary surcharge. This Peak Surcharge will be a flat fee per parcel and will be in addition to the standard surcharges that are applicable all year round. Please see below the specifications for each surcharge:

Std parcel charge £7.80 . Surcharge £5.00 Total £12.80

Large parcel £36.40 , Surcharge £48.00 Total £84.40

Over max limits £92.00 surcharge £77.00 Total £169.00

Basically If you are slightly out on the size or weight as they have your card details they will take the extra money

My solution is " I won't be using P2Go Simple