Disgusting customer service after a sale is complete!

My fiancé bought my engagement ring at Northgate and was told that N is the only Diamond Engagement ring sizes they have as it is the standard size, but if it doesn't fit, he can get it resized at any branch. ??? Needless to say that when he proposed, we saw the ring needed to be made smaller because clearly i don't fall in the standard! I took my ring to the Randridge Mall branch to have resized where i was told there's R90 to be paid...not mentioned at the sale. I got a call to say my ring was ready. When i saw my ring and called for the manager, Sharleen came to assist me. She blamed the poor workmanship on the resizer and even said that it shouldn't have passed his quality control...what about American Swiss' quality control when my ring arrived? Passing the buck! Needless to say, Sharleen said she would source my ring in a size M. I got a call a week later to say my rings have arrived. (Bought as a set) My fiancé and i go together to swop it out. First of all, there was no sourcing of an M, it was another N set sourced, then sent for resizing which now cost R180! This work was even worse than my current ring! I told the sales lady that it looks like they got the ring from Pep because it had raised bumps all over it and you could see where it was joined. Surely if the sales lady agreed that it was so bad, that once i place the wedding band on, that it would scratch it and ruin the band then it must be bad. Sharleen wasn't available but was called from the sales lady then i get told that Sharleen said if i'm still not happy then i must get a refund??? What kind of manager would suggest this on an Engagement ring? What about the sentimental value? You take a perfectly good ring, stuff it up and give it back to a customer? Is there no pride in one's work these days? Needless to say, i told them to keep the replacement rings as they were MUCH worse than the first stuff up they made. All my jewellery is from American Swiss, but i will never support you guys again and i have already posted this on Facebook and Twitter to be shared so that everyone knows that once you guys have the money, there's an I don't give a damn attitude! Now i have to sit with a devalued ring and American Swiss could not be bothered as they have their money! It makes me sick! Such a terrible taste in my mouth for something that was one of the happiest days in my life!