DTDC Courier & Cargo — important documents undelivered

My brother had sent a package containing documents related to our start up company via dtdc 2 weeks back in the first week of july. The package was supposed to have delivered within a week as the origin or package is karatagi in karnataka and destination of package is bangalore, karnataka. This incident is occurring the second time as previously also a package containing documents was sent with same origin and destination but went undelivered for a month. However, it is very urgent this time because we have a deadline from the karnataka roc to be submitting those documents by 14th july and today is already 13 july and it is still undelivered in spite of repeatedly calling them and registering complaint on their website. I've even stressed on escalating the issue to the higher ups to no avail. They keep assuring that it'll be delivered and i'll get a callback but do not call at all.