140% increase in my data cost

I received a call from Telkom marketing at the end of last year, wooing me, praising Telkom's LTE service and showing me how much I could save and how much speed I could gain if I changed from my ADSL service. I was convinced, let them come and install Telkom LTE at my home at a cost of R2000 and was assisted to purchase Telkom's 60GB 'anytime' + 60GB 'night surfer' prepaid package at a cost of R1800. I have since purchased a second such package. In the last few days, Telkom has introduced its new data pricing and packages such as the one they used to convince me to change to Telkom LTE are gone! Night surfer is gone! R1800 now only buys me a mere 50GB which was what I was getting on ADSL anyway. So, my reward for trusting Telkom marketing is a massive 140% increase in my data cost!!!! Seriously Telkom, how can you do this?!!!