I couldn't find any information on how to be a "cliente personnalité" (I assume you meant "cliente personalidade") of ITAU. However, I found some relevant results related to ITAU and customer service.

It seems that ITAU is a Brazilian bank, and their customer service might have its own set of guidelines or best practices. Unfortunately, the provided search results don't mention anything specific about being a "cliente personnalité" of ITAU.

If you're looking for information on how to provide excellent customer service or become a customer representative for ITAU, I suggest searching for more general terms like "customer service training" or "ITAU customer support". You might also want to try searching in Portuguese, as the bank is based in Brazil.