Vodafone — Stop outgoing calls since 2 weeks

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KONA CHECK POST

I have Vodafone SIM and we are using it last 5 year. Last 2 weeks I am unable to make calls. When we launch a complain in customer care they says we have negative balance that's why we are unable to make calls. I said its a prepaid SIM then how its possible. Customer care officer unable to show any cause or any documents why negative balance it occurs. Only forcing us to pay.