Cellphone contracts

I WJ Engelbrecht cell nr ********** 376 received a call from a vodacom telemarketer to inform me that i went out of bundle on my contract and that they want to offer me a upgrade on my contract from my smart large package to smart large plus which will offer me more minutes and more data, for a increase of R200 on my monthly installment of R639. I didnot take the offer but later on went to a vodacom shop to enquire about the new deal, to my suprise the new deal cost less than my currant contract. The new contract cost R329 per month. Is this how vodacom treats there loyal clients, by increasing there monthly installments.