Bad Service

I have purchased a wedding band online from the The Jewellery Design Company on 18 August 2015. When I received the wedding band on the 26 August 2015 it was not even cleaned and the same ring which was advertised on their website. I addressed a letter to them informing them of this and a certain Mark (with e-mail [Email Removed] forward me a email to apologise for the inconvenience and that I must visit their nearest branch which is Brooklyn to bring the ring in, in order for them to rectify their mistake. On the 28 August I visited their branch and handed the ring in where the manageress CT, indicated that it will not take more than a week and have made a follow up date for the 4th September 2015. CT phoned me on 7 September 2015 informing me that the ring is still outstanding. She promised to inform me once the ring is ready and will not be later than today, 11 September 2015. I am really getting frustrated with this situation as the problem did not occur from my side and does it not take two weeks to clean a ring, according to my knowledge. I have stressed out the urgency and still I have to be inconvenienced with the fact that they are late. I need this matter resolved asap.