DTDC Courier & Cargo — courier mishandled

As I'm a regular customer of DTDC this is the very first time I've faced this issue of non-deliverance. It was a office courier (Z[protected] by the name of Sushma Kumari on dated - 5/6/19. Your Amritsar staff gave me the numbers of your chandigarh staff when I complained for the said delivery. Thereafter I followed the given number and they told me the delivery has been dropped to security mens, just because of heavy load of courier. when I cross checked with company they still not received it. Now the Chandigarh DTDC staff said, that they didn't give the courier to security gaurds, they delivered it in office. With due respect I wish to state here that, there's no name and number mentioned
to whom courier has been delivered by DTDC boy, in the link provided to me, Sir/Mam, this is not the way you deal. Where's the said courier gone, still no reply from Amritsar/Chandigarh (DTDC) side.