Pick and Pay is very ********* with regards to online orders

Pick and Pay is behaving in a very ********* way by changing amounts charged on online orders when any changes are made to the order - even if it is only to change payment method. I have placed an order and requested it to be delivered on 07/02/2023. I changed the payment method from one credit card to another - without any other changes like additional or deleted products. To my surprise I noticed the amount for the order has increased as most of the special prices were changed back to normal prices. Which is not valid as when you actually want to change items on the order the website warns all users that they will only be able to get the price charged as per the specials active at the time of the original order - not that all items not currently on special will be changed to original prices. After a couple of mails to Pick and Pay on this I have received feedback that ANY changes to an order will result in the special price falling away - which goes against their own note on the website. This is very ********* as I am sure lots of other clients would not notice the difference and just pay the increased amounts. I will be asking the consumer protection commission for advice on if we can report this for further investigations. Also, I have cancelled my order and WILL NEVER purchase from any Pick and Pay again - lost my interest. I will be closing all my accounts and will cut my points card as well. Although it is bye from me, I will see you in all legal channels I can get access to.