Checkers - Eezi Coupons *****

I like to use eezi coupons and I take pains to calculate my discount. According to my calculations and the checkers app on my phone my savings of my transaction should have been R120-00. After I put the eezi coupon code on in store it calculated my savings at R40-00. I spoke to the manager and he said he can only give me the R40-00 off and not the whole amount. He said that I must phone their customer care. I did not purchase the goods because they would not give me the discount. At customer care the lady told me that she cannot do anything for me unless I purchase the goods and even then I'm not guaranteed my discount. I was really disappointed, because they advertise great savings, but when push comes to shove you don't get what was promised.