St Courier — delayed delivery and no response

Address:

166/140 doss nagar, Chennai, Tamil Nadu, 600128

Courier has been posted on 21/09/2019 for delivery within chennai - kannigapuram to kovoor. But it's has not been received till 26th of september, when contacted customer centre they responded that they will get back with the issue immediately and gave the number for contacting the person. But no one responded. I have been following it up for past two days as it is a book which had been couriered for exams. Feeling frustrated. A waste irresponsible courier service ever seen. Will surely not recommend this to anyone and also the way you make service to the people will surely be posted in social media. Thank you for your irresponsible services.