Cancelling a Vodacom contract

I took a Vodacom contract in April 2017. From the start Vodacom made an error with the new contract - putting the contract that was upgrade a month earlier's terms on the new contract. Issue was resolved after numerous phone calls etc. Have decided to cancel the contract taken out in April 2017 when it expires this year - low and behold when I check cancellation date - contract only expires in 2021??? Phoned Vodacom contract cancellation department on 4 January 2019 - they will send an email to another department to have the dates fixed - 5 working days. Phoned again on 16 January 2019 as it still reflects to only expire in 2021. Apparently person No 1 did not sent the email. Logged another call and received a reference number - 72hrs. Phoned again on 22 January 2019. Apparently they cannot fix it I have to find out who upgraded the phone without my knowledge. Contacted the shop where I took out the contract - no problems from their side. Information was submitted correctly, no upgrade done. Phone again today (29 January 2019). Original reference number was logged incorrectly. Receive a new reference - will be resolved in 48hrs. Lets wait and see. Will update with progress.