Shiprocket — Not working on NDR, and resolve issues, Making RTO and detect charges

I am using shiprocket for courier but now days I am facing lots of NDR comments and late reattempt.
I have multiple Times call to customer support of shiprocket but no any proper solution from their side.
This activities impact on our customer experience and making our business loss making.

We have multiple times call of customer support and spend a long time but not any proper action and solution we are feeling irritated & helpless.