Disgusted and shocked at poor after sale service

I purchased a ring on the 5 February 2017. The ring was unique and beautiful but a few months later, June 2017, one of the settings fell off. I was able to locate it. I took the ring back to the Sandton store. I was told that they would speak to their regional manager and let me know. I never heard from them. I went into the store in August and I was given a New ring. In December the same thing happened. I returned it and never heard a word from the company until I went in to the store in Mid February. I was told that the ring had been repaired. The ring looked dull and the setting did not look the same. A day later I wore the ring and the same thing happened again. I then tried to contact the manager/regional manager. I sent an email on 01 March 2018 and to this day 13th March 2018. To date I have not received an email, neither acknowledging my email or offering me a solution. I then called a lady by the name of Tamzin and left a message for her to call me. She called me on the 2nd March 2018. She promised me that she would discuss it with her manager and revert back to me. Today, 13th March 2018, I left another message for Tamzin to call me, she has just called me saying she did discuss with Mia and no decision has been taken. I told her I would like to speak to someone more senior or an owner and was told she is not at liberty to disclose their details to me. She has called me back now, offering me a credit note... I am totally disappointed with the relaxed manner in which complaints are hamdled. There is NO customer service or after sales service in the company. The staff in the store are not trained to follow up or even call customers to update them or let them know their stuff is ready to be collected. Let alone management who cannot keep to their word and return a call. After me getting angry and threatening to put a post on this site, I am told i will get a credit note.... It's disgusting and shocking to experience such poor service for such an expensive product...