Wedding band

My husband bought me a ring for our 10th wedding anniversary at American Swiss Southgate Mall in 2018 the ring was small and they send it to be sized I paid for the ring to be sized in 2020 where they sized my rings it turned black I took I to the store and I phoned head office I told them I don't want this ring because gold can not turn black they called me back I went to the store the lady by the name Lindiwe promised me that my ring was fixed and it won't turn black again I didn't believe her and I didn't wanted to take the ring my husband was with me and he said to me trust the lady and take your ring witch I did and then boom this year my ring turns black again at the same place at last time I phoned head office again and I took the ring back to the store the same lady that helped me in 2020 helped me again I asked her Lindiwe do you remember the issue I had with my ring she she said yes and told me it's not the stores problem it's they supplier that sizes the rings problem I left the rings with her she told me she will give me a call on Friday cause the manager and the supplier will be coming to the store the Friday it's Tuesday today and still no call from her and like I told her in the store my husband payed a lot of money for that ring I don't want that ring back they will refund me I will go to another jeweler and by myself a new ring that is not gonna turn black I'm very disappointed in America Swiss quality of gold and they services