Thank-U points system now becomes a No Thank-U points system

This Thank-You point system of Edcon I cannot understand at all. On 22/09/18 a purchase slip showed R96.72 points value after the August & September purchases of clothing as well as approx. R2600 of petrol swiped. After another R590 petrol swipe and a R119 purchase on 04/10/18 the purchase slip showed R113.90 points value. Then suddenly after another petrol swipe of R100 I received a sms on 08/10/18 informing me that I have now only R112 points value and then after another online order of R199 on 14/10/18 on my account another sms on 15/10/18 informing me that I have now only R63 points value. To clarify this strange phenomena I called in to the customer services on 15/10/18 at 17:10 and after I explained my confusion in this regard consultant wants to convince me that according to the info on the system Edcon has granted me a bonus of 50 000 points valued at R50 only valid for 3 days and as it has expired they subtracted it again from my points value. The fact is that firstly at no stage I was informed of this so-called 50 000 points promotion valued for only 3 days. Secondly on 22/09/18 my points value was on R96.47 and on 14/10/18 on R113.90 and then suddenly reduced to R112 on 15/10/18. Thirdly that means that for a period of 24 days my points value was between R96 and R112 and now suddenly reduced to R63. So where does this argument comes in that it was a points value of R50 3-day promotion that was added and then subtracted again as it was not utilised within the 3 days. Nowhere this 3-day promotion argument makes any sense in the time slots given. They can listen to my audio conversation and I can give proof of all sms’s received from Edcon. My conclusion is that it doesn’t matter how you try to build up some Thank-U points value with purchases and petrol swipes, Edcon now add and substract points as they like as this is the first time this happened. This is very disgusting. Previously I had numerous problems with faults on my account and now it happens with the Thank-U points system as well.