Cielo worst aftersales service ever received

I am deeply disappointed with the service I have received from Cielo. They delivered incorrect items, and despite logging a ticket and calling/emailing daily for the past three weeks, I have received no contact from their customer service team. Each time I call, I am passed around and told the issue has been escalated, but no timelines are provided. This lack of response and accountability is unacceptable. I am still awaiting a collection and refund.