Data Package Increase (24 Month Contract )

I received notification of an increase in my data package. My contract is 9 months old , my understanding is that data package is valid for 24 months. <br> <br> I was not informed by the sales consultant at the time there would be a price increase in the middle off my contract.<br> <br> I am not willing to pay the extra charged on my data package. <br> <br> I've been a loyal customer for more than 10 years and have 3 contracts with you. Please do not make choose another service provider .