Really really bad service!

A week ago I phoned vodacom requesting for a contract cancellation, they decided to upgrade me. I have been trying to sort this issue out but I am getting no help. Now that I try to phone them they have blocked my number, I went to vodashop they couldn't assist me. I requested call backs, still nothing. I am being forced to stay a vodacom client! Asking for help and not getting any help. Worse Service ever!!!