Upgrading contract with our consent

Having endless issues with MTN. I want to talk to an manager to sort out the issues. Also I want sales representatives to refrain from contacting my grandfather. I have submitted an power of attorney letter in order for me to make financial decisions. It has been added onto the system. I demand representatives to contact in the near future. ********** 415. I want my number to be the contact number on the system. I want this sorted out with immediate affect.