Debit order

Took out a contract in 2024 with instalment amount of R1099 which I was debited for a few months, in 2024 still premium went up to R1140,89. In 2025 premium fluctuated between R1099 and R1128. 2026 premium is now gone up to R1158 and I’m being told it’s because I get more data than I was originally of which I did not request or ask for. I’m on a plan where once my contract bundles have been depleted I top up on my own. Nobody can explain to me why this is happening instead they say they’ll investigate and get back to me and nobody has. Called in again today and I’m being told to read T & Cs and that the 1.4 data bundle is no longer available and has now gone up to 1.5 without communicating anything to me.