Mislead to Migrate to an expensive plan

I've been satisfied with my vodacom contract till I was mislead by a consultant who offered a migration plan that seemed like a bargain but I ended up paying double than what I was offered. I tried to send emails and made calls but this matter has not been rectified. Im not the only one who has this issue. It's either this migration is reversed to the one I used or I cancel my contract. These call centre consultant are just after extra cash by misleading clients. This needs to fix as quick as it took to migrate.