  We study linear massive scalar charged perturbations of Topological Stars in
the fuzzball and in the black hole (Black String) regimes. The objects that
naturally couple to the electric 3-form field strength of these solutions are
charged strings, wound around the compact direction. We explore the possibility
of instabilities of these solutions, in analogy with the charge instability
already highlighted for other non-BPS geometries like JMaRT. This issue is
addressed by calculating quasi-normal mode frequencies with a variety of
techniques: WKB approximation, direct integration, Leaver method and by
exploiting the recently discovered correspondence between black hole-fuzzball
perturbation theory and quantum Seiberg-Witten curves. All mode frequencies we
find have negative imaginary parts, implying an exponential decay in time. This
suggests a linear stability of Topological Stars also in this new scenario. In
addition, we study the charge superradiance for the Black String. We compute
the amplification factor with the numerical integration method and a quantum
Seiberg-Witten motivated definition including instantonic corrections.
