Rain is going DOWN THE DRAIN & CAUSING PAIN

Good day, I joined Rain on the 24th of March 2021 and received a promotional upgrade on the 30th of August 2022 for long service with your company. Since then, I have been paying R 599 per month. Now you have sent me an SMS, stating that from the 1st of June, my 5G home STANDARD subscription is going to increase by R 40 to R 569. What I would like to know is why I have been paying R 599 since August 2022? Is this how you treat your long-term LOYAL clients?