Migration - DO NOT DO IT!!

Vodacom phoned me regarding a migration deal. the lady ensured me they are doing this to help their customers and that there will be nothing changed on my debit order. she gave me all the amounts saying that my debit order will be exactly the same. i just get more minutes per month. i asked so many times that she must repeat it and make sure that the call is recorded. Who would say no to getting more calling minutes with no extra charges? so i said its fine if nothing else changes. Now my debit order is more!!! i phoned vodacom asking why is my debit order higher, they say it is because of the migration that i agreed on. I did NOT agree to additional costs and i repeated myself on that phone call so many times.