Mis-informed by Vodacom Agent

In November 2021, a call centre agent from Vodacom called me to offer me a discount package as im buying additional data. The agent explained that instead of paying R600, il be paying R450. I was surprised and asked her what's the catch and she explained that there is no catch. I also asked her if she is sure that i will not be paying R600 a month anymore and it would now be R450 and she confirmed. i was very glad but only too find out the next month that she made a error and I'm now paying R700 instead of R600.. This is unacceptable, the agents need to be careful when migrating customers and need to make sure that they give us the correct information !