Contract Upgraded ???

This morning I received a Telkom bill for an upgrade of +- R583 for my personal cellphone... How is this fair with no written communication or no-one to advise that I will be billed so much for a contract that I originally took for +- R370...<br> <br> I am a student and the only income in my household so how can we as consumers not be properly advised of the extra charges we would face.<br> I believed I would have been downgraded to a smartplan 100 Contract as per my old contract, unaware I'd be billed for Telkom's downgrade in the data provided from 5gigs to 1gig...<br> <br> I have tried contacting the call center on 081 180 but I have been on hold for about half an hour in total...<br> <br> I need someone to contact me urgently as I am not paying for the amount I have been billed...Telkom can take the data back as it is still fully loaded on my sim...But I am not prepared to go off my budget and pay this extra cost<br> <br> I have loved the service I received from Telkom... But this makes me feel like I am being ******,<br> <br> Thank you for your time & patience <br> I hope this matter is resolved before my next billing