HDFC Bank — airtel charges 3 lakhs on my personal hdfc bank account for a deactivated company provided connection

Address:

560068

I returned an airtel sim card provided by my company in september 2018 before travelling out of india. The number was [protected]. I have a confirmation from my company that it was deactivated in september 2018 itself. Please note that it was a company provided sim and had no link to my personal bank account. After 4 months i see that airtel has sent a bill for some 3 lakhs rupees to my personal hdfc bank account bill payment. This is extremely unbelievable, unexpected and unacceptable. Where did they get my bank details? How do you accept a bill that comes without my consent or knowledge? Isn't it fraud? I don't know how many more such customers have been harassed like this. I want hdfc to investigate this thoroughly and get back to me with the details at the earliest. I also want to take it to the notice of relevant authorities to ensure airtel and hdfc are made accountable for this major unethical scam. Please advise. Thanks.