Horrible quality of beadwork on expensive dress

I regularly buy clothing from forever new and headed there to buy a dress in October for a wedding that i was to attend in Australia in November. I bought a slinky navy blue maxi evening dress with embellishments on it for R1800 and took it to Aus with me. I sent it to get dry cleaned in Australia (as the care label said it can only be professionally dry cleaned), the dry cleaners that i took it to clean evening and wedding dresses on a daily basis. When i got my dress, due to the embellishments not being sewn on properly, came off in patches across the dress. This happened the day before I had to attend the wedding. I then had to go and buy a new dress at the last minute although i spent so much on the first dress. When buying clothes from forever new, a certain level of quality is expected yet i wasted about R2300 (R1800 for a dress that i never wore and R500 for professional dry cleaning services) I'm utterly disappointed and request a refund for my costs, I have the tags from the dress and the receipt from the dry cleaner as well as a letter from them stating that they are a professional service and have not had this type of damage to a dress before.