Tell the seller that due to technical issue with blue dart they are unable to pick the shipment therefore request you to kindly re-assign the shipment to a different courier.
In case the seller disputes about freight charges, then we can provide a refund (partial or complete depending of seller's ask) to them.
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Script : Due to operational issues Blue Dart is currently unable to pick up the shipments, we request you to kindly re-assign your shipment with another courier