[new 2 q's]

Wags has Purex at B1G1 free. I bought the liquid detergent at 8.99 and got the new 3 in 1 detergent to dryer sheet. I used a .25 cent MQ on the liquid detergent and had a 2.00 MQ on the 3 in 1 product. First they did not give me the 3 in 1 detergent free as it should have been. So I spoke with the manager. After a couple of minutes she finally decided that I should have gotten that free as it states in the ad. But, they charged me 6.99 for it and since I used a 2 off MQ she could only give me a 4.99 refund. Is this right? I did buy other things (about 20.00 worth). I think I should have gotten it for free (it should have rung up correctly the first time) and my 2.00 off the entire order.