Upgrade gone wrong

Please help me to cancel my vodacom upgrade , on the 19 April i receive a call from vodacom telling me about upgrade , she explain the offer and we agreed to upgrade promising to send the phones on the 22 April (Monday) with no lucky. on the 25 April i went to Vodacom shop at Brookly to check the status of my upgrade and i was told to call *** and the lady say there is a record of upgrading but on record of the delivery I then request her to cancel the upgrade and she said she sent the request and i must wait for 3 days . today i called again to do follow ups and was also given *** to da cancellation , when i called i was told that this is not the right platform the lady dropped the call. please help me to cancel so that i can go to Vodacom shop to upgrade.