Price inflation when interest shown

Takealot is not bad in the most sense of the word bad, however there is a odd occasion where a mist3is made eg, I got a wrong product once but it turn out fine so I did not complain as it takes alot of back and forth. Let's get back to the complaint, I search led a product it was R540 for a while once I added to my cart as I was saving for it a month later it went up to R899 fine but here is what gutted me, for 2 months the price went up and stayed at R899 the moment I bought it for that price the next day the price went back to R540. In this day and age how can they alter prices when they see interest in things utterly disgusted. Obviously nothing will come from this complaint because they a huge entity and we are but just a fly on the wall. Thanks Keenen