Supplier not delivering the agreed contract

Requested an upgrade on phone contract. Indicated delivery of phone was a few days later. After approx. 2 weeks of follow-up and visits, store manager (Abi) admitted that the phone has a stock issue. After consultation she suggested that I take an upgrade without a phone. I was happy with her suggestion (1g day & 1g Night data with 50 minutes for R94 p.m.). Two days later I checked with the call centre if this was the upgrade that was loaded. They had something different on the system (Lower package with Nokia phone for higher instalment. I visited the store again and Nadine helped me as Abi was not in. I explained that the package agreed on was not the one loaded. She did changes on the system and told me that it would now be correct. I again checked with the call centre and it still was not correct. Visited store AGAIN. Spoke to Abi about this and she told me that I had to wait after the 23rd when the upgrade will show on system. Phoned call centra again today. Package is now correct, but premium is now R199 pm and not R94 pm! Phoned Abi about this. Now she informs me that I HAVE CHANGED THIS PACKAGE and now have a migration and not an upgrade any more! -All I want is the agreeme