15gb pro contract not Cancelled

I placed an order on the 7th September and for the uncapped LTE promotion on condition that my 15gb promo contract be migrated to the new uncapped contract the sales agent verified that this has been done I subsequently followed up 3 times to confirm that the contract was migrated only to find out that this has not bee done I called 180 & 10213 to asked the agent to migrate my contact and they all confirmed that the contract has been migrated but I was suprised to today get my October invoice and the 15gb contract is still active and was never migrated. This is unacceptable and have been to by the sales and call centre agents and I cannot be expected to pay for 2 contracts when I specifically I waned to old contract migrated.I Logged a call on Hellopeter on the 2nd of October but I received no response I subsequently went in to the Menlyn branch to cancel the contract on the 30th of October and I was informed that I will be phoned by someone to finalise the cancellation but no one phone and I am still being billed for 2 contracts despite the cancellation request . Your assistance will be greatly appreciated.