Explain, please for what my acc closed ???

I played with my friend after server down he was teleport to Gm island and spoke with GM then my acc closed allegedly for multiboxing its joke???? to day all day server working poor and sometimes fall!!! you know it !!! Maybe somebody see that when we lagg or got DC he think what is it multiboxing and wrote ticket! if i was online too in this moment and got teleport on GM island too you would be able to verify that it is not multiboxing!!! With best regards!!