From the blog

SPECIAL OFFER FOR CUSTOMERS OF VIETTEL ++

Are you planning a vacation with the goal of a nice hotel with good food but the reasonable prices?

Please choose the special promotion of Navy Hotel Group for Customers who are using products and services of Viettel.
Special discount 65% off room rate, staying 03 nights or more get FREE 01 extra night, 10% discount when using food and beverage services at our restaurants.
The program is applied when customers stay at Navy Hotel Group including: Navy Hotel Da Lat (Hotline 0913 712 834), Navy Hotel Da Nang (Hotline 0903 021 308), Navy Hotel Cam Ranh (Hotline 0987 566 736).
Promotion period: valid from now until the end of January 31, 2020.
You can see the details at My Viettel App. download on App Store, CH Play