Sterns N1 City Mall - Very disgusted and disappointing service!!

I would just like to point out as to how disappointed I am in Sterns at N1 City Mall. I bought my wedding ring (gold) there and it was told to me that I can bring my ring in anytime during the day to get it cleaned if it had to be dirty. So for the past 2 months, if not longer, I've been going there quite a few times to ask if they can clean my ring as it is dirty. Every single time that I've been there so that they can clean it, they tell me they don't have the cleaning materials (dip and so forth) as yet since they waiting for stock to come in. I then asked if I could clean my ring with another jewellery store and the lady said, yes it's fine since she doesn't know when they will get the cleaning materials in. And it had to be done otherwise my ring is going to have to get sent in (to their warehouse or wherever they send it) because at the end of the day it's going to be so dirty that they wont be able to clean it in store. I had to pay at the other jewellery store to get my ring cleaned up since I didn't purchase it from them as where Sterns would've done it for free for me. I honestly feel like the staff at Sterns (N1 City Mall) doesn't even care about their customers, as long as they can just make money and then whatever happens to the product after that, it doesn't matter. They never even apologized for not having the materials to clean my ring, not even up and till today did they apologize. It just gets said every time I go in there, no we don't have the cleaning materials yet. Why should I as a paying customer of Sterns go to other jewellery stores to go get my ring cleaned and then still pay for it?? I will most definitely never/not recommend Sterns at N1 City Mall to anyone I know. They have that "I don't care" kind of service and it's beyond disappointing as to how they make me feel when I walk in there.