Loyalty points ripoff

Approximately 6 months ago I went to Lifestyle for garden stuff and was offered a loyalty card. Got the card, did the shopping, paid and got an email saying welcome and all that and there was R23 odd on the card for me to spend. Drive all the way back a couple of months later however the item I wanted was not in stock. Get newsletters and promotional stock items etc. and decide to go back on Friday as I had a gift card and was looking for some stuff. My first issue is pricing I can get the same items at a better price at my local nursery or Builders or even PnP/Checkers and do not have to drive all the way there. My second issue when I was paying and asked the cashier to redeem my points she tells me there is only R16 odd on the card. I was never told that the points decrease after a few months. Sent an email to them on Friday and to date no response. My daughter also checked her card and the points have also gone. Not a good way to keep me as a customer!