Migration Nightmare!

The worst! They migrate my account to Vodacom and indicate in the recording "we are busy improving our services to you" - what *******. Ever since they have migrated my phone to Vodacom, I have to go through various steps every time I switch my phone off or move into a different reception area (while travelling) and have to search for an available network - this is EVERY TIME!! I have called the contact centre but no assistance. I do have my Data Roaming on all the time and I still have the same problem. I did not ask for the migration - I had no option - I was just informed and now this! It is also a security issue as I am not even aware all the time that I no longer have connectivity. If something happens to me, what will Cell C do?????? I want to cancel my two contracts immediately so that I can move my contract to Vodacom and not have this migration issue. Can someone competent from Cell C contact me to facilitate this cancellation of my two contracts?