BAD SERVICE/ATTITUDE AND LIES

I purchased a ring on 09th from Sterns @ Pav-as a gift. We queried abt the sizing, as we knew it would not fit the receiptient (GF). On Sunday, the 07th June, GF called the store, only to be advised that there was a fee, i contacted the store, querying this, as we were not advised of this, despite enquiring on purchase, the lady that attended to this was Diane, who I found out later was the person that sold the item to us. One asking to speak to management, Diane advised that the ring can be brought in, she would not charge the R100 fee, I queried as to when the item will be ready as GF was leaving for JHB on Friday, i was advised this will be ready by Thursday. We dropped off the ring,Diane even mentioned that the item will be ready by Thursday,she can even try for Wednesday.The item was to be collected on Monday morning as per Diane. yesterday GF gets a call, stating that the ring was collected & the R100 levy app****, the item will not be ready by Thursday. i was given a Jacki's number to contact, this went unanswered. I spent a lot of money at Sterns, this will not be my prefered choice - I would like a full refund on the item, due to this pathetic service! HO does not assist