Heartbroken about my ring

My fiancé bought an engagement ring online, We went in asking for re-sizing, we we're aware of additional payment charges and waiting period.

At first the lady did not really want to help us and she kept on insisting for the receipt which we then got online, even then she was looking at us funny. Giving off a vibe like we dont have enough money because we're not buying an expensive enough ring.

She then said store policy says they are not allowed to re-size the ring 4 sizes. When we asked okay so what does it mean what are our options, she just said we must decide.

Not understanding what she means with we must decide, she eventually said we must look online for a different ring they cannot help us... American swiss you ruiend the most important and happy experience of my life😓 now i am sitting with a beautiful ring i cannot wear.

All your sizes are N on the website, how am i supposed to choose a ring size S or T in rose gold.

Is there no way you can assist?