Airtel — IR charges with out using internet

I have travelled to Singapore on dec 2022. I have opted IR services on. But I never used internet. Still i have charged 6.5rs for 10kb. That costed around 2751rs. Without using data, every 3hrs 10kb is consumed and over all usage is around 195*10kb charged me around 2751.
Customer care doesn't understand the problem they are saying i have used 10kb.
I don't know what all we can do with 10kb data. They have simply charging extra