Airtel
Deduct money in wrong way

I am user of airtel from long time

3rd july near 12:45 they deduct money from my balance

when i call at 1:05 they cut the call

again calling they assure me that mistake will from their side but they can't refund money or proceed my complain

but i didn't receive any detail from their side of complain register

where is customer services?

is it the right way for airtel to earn money and increase profit?

I hope you listen pls help us