I have been a Cell C client since the first BlackBerry came out and have had several accounts

I have been a Cell C client since the first BlackBerry came out and have had several accounts. Took 2 in 2021 just two days appart. These past two months both went up with R10 each no explanation and no warning. Contracts was signed and surely agreements should be kept in place. Cell C I need a decent explanation and refund or I will vent further on other social media platforms. Not happy at all.