Delhivery — Packaged return without contacting me

Hi, I am extremely feeling unsatisfied and annoyed as whenever my courier is sent to me through Delhivery, no once trying to deliver the production and returning the same without delivery even without contacting me. There no option to connect to the delivery agent nor the customer care number is getting through mentioned on the website. After raising multiple tickets they are not even responding they merchant cancelled your order after reaching the destination and merchant says he hasn't.
Looking forward for better resolution.