Bluedart — Regarding customer care

There is just signle number for customer care and to complain and for inquiry also and interesting thing is that, that one and only number answer that "the line is busy " and suddenly call disconnect.this is the service of the reputed company.one more thing is that there is no other way to reach them or contact them.my courier with bank cheque was sended by party, but i didn't received the courier and company tracking id shows you got the courier by the time and here no clue of get the courier, what should i do, no paths.