I had booked BOM-MAN_BOM on Lufthansa in March, but had to cancel the tickets because of Covid-19 pandemic. The Lufthansa site said full refund. However, in spite of two reminders, I have not received anything.
Their India phone number, 1800-102-5838 does not work. After a few options, you seem to be connected to a human, but the phone quickly cuts off. I have never been able to get through.