ecoPayz can initiate a phone call due to 2 reasons
1. They get suspicious on fraud or money laundering. In this case, a phone call is a good way to explain the activity on your account. Get prepared and talk to an ecoPayz representative. Tell only the truth as even bad truth is better than a lie.
2. They can also call during your application for VIP status which implies high volumes, so the ecoPayz representative will ask you what are you planning to do with your account. Basically, the goal of such calls is to confirm your identity. The conversation is pretty short, followed by simple questions. It is better to answer all questions and tell the truth.