Checkers hyper not able to Honor Xtra Savings Specials

ON 14 December 2023 I get a SMS message that Checkers is running as special for 15 to 7 December 2023 Get your pool summer ready and save R330-00 on a 15kg HTH Granular Chlorine for R499,99 at Hypers only On the 16th i went to the Checkers Germiston Hyper to find out there was no stock. Was given a voucher which we could redeem once stock has arrived Over a month later still no stock Is this another case of false advertising?