Support team **** to me on migrating option!

Took out a lte package last year with a router and have been struggling numerous time on the mtn network and logged calls whereby i have struggled once for almost a week with no internet connection. I phoned last week and told the support team i want to move over to the vodacom network since it was previously suggested by a consultant that in my area that we have more vodacom towers near me and will work better. So we discussed and i told the support team that i cant use the migrate option on client zone as they suggested and the person i spoke to said that i should place a new order for the vodacom sim and that they will ensure that the mtn one will be cancelled so that i wont be billed twice but now since im waiting for the vodacom sim i was billed yesterday and the sim has not been delivered yet and am being told now by the whatsapp afrihost team that i cant migrate and that the other package mtn should be cancelled!