Extremly disappointing workmanship, attitude and business ethics

I March 2020, i purchased my mum a protea full bloom ring, my mum used it 3 times and the main diamond fell off, all was resolved which i appreciated. However in September 2020, i decided to add into my mums collection and purchase her the protea earrings that went along with the ring, 2 months later and still NO earrings. The first time was my doing as i wanted the earrings to be changed from rose gold to yellow gold. When the earrings arrived, the ***** at the back apparently was loose, this was after the earrings lay at browns gateway for about a week ( i was too busy to fetch it) thereafter the earrings were returned, however i did not receive what i paid for, which was a 0.16 diamond as i was told, when recived and on the certification it is a 0.15, so i asked it to be redone with the correct size and i made it specificly clear that i needed the earrings back for Diwali, which ofcourse i did not receive. Had i taken a 0.1 diamojd extra, Browns would of changed me for it but when Browns givens you a 0.1 less its perfectly fine according to their sales reps. I also have been following the price of these earrings which were marked at R15 000 and some odd in April, all of a sudden the price goes to nearly double and that is apparently after the discount? I wanted to purchase the protea chain for my mum for Christmas but after the pathetic service, workmanship and attitude, i would rather support a jewellery designer that actually wants my business. I have also tried contacting headoffice 4 times today with 0 answer.