Bakari, A.R., Christina, C.H., Ninditya, D.P. and Iffan, M. 2021. DIGITAL CUSTOMER SERVICE: THE EFFECTIVENESS OF COMMUNICATION IN TECHNOLOGY REVOLUTION 4.0. International Journal of Research and Applied Technology (INJURATECH). 1, 2 (Dec. 2021), 403-409. DOI:https://doi.org/10.34010/injuratech.v1i2.6770.