Terrible service from Vodacom contact centre agent

Terrible service from an upgrade consultant, I requested to speak to the manager because i understood that the agent could not assist me with the query i had, instead he put me on hold (not even on hold, on MUTE) for 55 minutes then after realising that I am not putting the phone down he transferred me to survey to rate his service. I rated him very bad however no manager called me back still to find out why i am not happy with the service. i spent hours with the contact centre just because the router delivered to me did not have a sim card. THIS IS VERY BAD