[Resolved]  Vodafone India — billed unreasonably, customer service not helping, and stolen personal data and making calls to my friends and family from different personal numbers

I had asked vodafone to provide me cheapest international roaming plan in the month of may 2019. They provided rs. 149 plan and when i came abroad, they charged me rs. 2500 for 9 mb data usage whereas i had already asked them that my number should only receive sms. This happened 4 months ago and i had emailed them to sort out the bill which they did not do. They kept on charging bill on my mobile number and today after 5 months that i am not using that number, they are calling my friends and family members and threatening them to pay a bill of rs. 5700. I don't understand how they can charge some unacceptable amount on rs. 149 plan. They call from different personal numbers anytime during day or night (My relative received a call at 10 pm indian time from a personal number) even on whatsapp. I have already emailed them again to help to sort out the bill (We informed them to reply on email but they still keep calling) but they keep on calling and messaging my family members every few seconds. I don't know how can they call anyone from my contact list and ask money to them. Infact they have called some people who are not even on my contact list and i myself never called them so i suspect this might be a serious data theft case. I am afraid my personal data is being shared for some hazardous causes and if they are running some scam. Not sure if vodafone has hired some recovery company who blackmail and threaten users, and rob their personal details. Now they are threatening to file a case on me and defame me by calling all contacts from my billing information (I believe this is not allowed to them). All this has disturbed me a lot and i am now going through mental trauma. Please help me as soon as possible to resolve this as this is really affecting me.