Vodacom sales is a ****

Evertime I do an upgrade with Vodacom it's a big hustle or problem.I have been with vodacom maybe 20yrs and I do contracts,last month I did an upgrade again and no one said anything about my special offer that I took yrs ago of 5GIG it will fall away if I upgrade.I got a good 90 % or 95 % off for 5GIG yrs back and the other one of 100 mnts.I was told it can only be cancelled when I say so,otherwise I will always have it.Now boom a surprise after an upgrade it's not there anymore.when I call they say it fell away bcs of the upgrade it was 1 thing with that contract whereres it was a separate thing.How come I still have 100 mnts and 5GIG is not anymore because I took both items on the same day and when I was upgrading I told that lady that I don't want anything to happen to those things n she asured me now today its a problem.I want my 5 GIG back and discounted not 50% off that you guys want to offer me when I told you that I don't want something that I won't be able to afford but today I have to buy it aside.Tell me Vodacom what will I do with 500 mb a month?I took that offer knowing I will still have 5GIG and it will be enough for a month.I have fight with you all the time I upgrade guys this is too much.