Same Power of Attorney Was Rejected Even After Renewal by Garanti BBVA

As my wife cannot read or write, I have opened accounts at other banks such as Yapı Kredi and Akbank using a notarized power of attorney in the past. When our workplace transitioned to Garanti BBVA for payroll, we were instructed to open a new account there. I was informed that the power of attorney required renewal, so I took the necessary steps to get it done. Then, I was told it was still lacking some components and had to be redone again. I really can't grasp why the same document worked for other banks but not for Garanti BBVA. The experience was quite perplexing and draining on my mental energy. The bank complicated matters instead of providing support, leaving me doubtful about their commitment to customer care.