Pnp bottles / ASAP not refunding money owed

I ordered from PNP ASAP / Bottles a variety of meat. I would be charged nearly R50 more (the original amount as when ordered). I took it up with them and I only got refunded for not even a quarter of what is owed to me. I have used only PnP since they launched their app. I will definitely spread the word that they are dishonest with their customer policies and *****ing in legal terms.