Takealot cancels ordered items emails you its "unavailable" while item remains orderable on site but at higher price

This is now 4th time in 3 months that Takealot is cancelling items on my orders. normally its understandable. However I started noticing a trend, they send you a notification that the item is "unavailable" and hence cancelled the item but if you go to the website the item can still be selected and ordered form the same place but at a higher price. this time by over 100 rand.