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Whom should I contact for problem with IPO UPI mandate request?

Zerodha (Flat Rs 20 Per Trade)

Invest brokerage-free Equity Delivery and Direct Mutual Funds (truly no brokerage). Pay flat Rs 20 per trade for Intra-day and F&O. Open Instant Account and start trading today.

You should reach out to your bank with the Unique Mandate Number (UMN) for any problem related to the IPO UPI Mandate block or unblock request.