Still waiting for my ********** upgrade to be finalized from December

I reported a ********** upgrade on my vodacom contract and indeed the ***** department confirmed there was ***** done. My problem is i am still getting billed for the *****ulant upgrade my contract has not been changed back to what it was before. At the moment i can only receive call on my phone, no data , sms or outgoing calls. been calling upgrades, accounts, customer care with no luck for the past 4 months