Not happy with takealot!

I ordered a few items on the 22nd December, estimated delivery date was 5th January. I waited almost 2 weeks, today 3rd January I got a message saying they can't find stock of 1 specific item which cost R403 and cancelled the item and automatically sent the credit to my wallet on my takealot app. When I went into my app I looked for the same product that was cancelled and saw it is still available but priced at R489. Did they cancel my order I was waiting for almost 2 weeks and paid for just because the price has increased even though I paid the price it went for at the time?? If this is the case then takealot you are unfair and treating your clients bad.