Pain and swelling from V-Olelet injections to destroy excess double chin fat

My weight hasn't changed much compared to before, but fat has accumulated specifically under my chin. Even when I tilt my head down slightly, my double chin overlaps, making the boundary with my neck look blurred. It is a major concern that my jawline looks dull whenever I look in the mirror or take profile photos, making my overall impression look stifled. I heard that regular contouring injections simply reduce the size of fat temporarily, so the results return to normal if I gain weight again. However, I heard that V-Olet injections destroy fat cells themselves for permanent effects, so I am considering getting the procedure at Maypure. However, I have seen many reviews stating that the area under the chin swells severely and hardens for several days after the procedure. I would like to know how long it typically takes for this swelling and pain to completely subside, and how many sessions are required to smooth out the double chin.