The spectroscopic parameters and partial decay widths of the light mesons a(0)(980) and K-0*(800) are calculated by treating them as scalar diquark-antidiquark states. The masses and couplings of the mesons are found in the framework of QCD two-point sum rule approach. The widths of the decay channels a(o)(980) -> eta pi and a(0)(980) -> K (K) over bar, and K-0*(800) -> K+pi(-) and K-0*(800) -> K-0 pi(0) are evaluated using QCD sum rules on the light-cone and technical tools of the soft meson approximation. Our results for the mass of the mesons m(ao) = 991(-27)(+29) MeV and m(K)* = 767(-29)(+38) MeV, as well as their total width Gamma(a0) = 62.01 +/- 14.37 MeV and Gamma K-0* = 401.1 +/- 87.1 MeV are compared with last experimental data. (C) 2018 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license.