Supersonic dont care about their clients

good day.. since day 1 i didnt have any wifi at night.. had to make calls everyday for a month before it got better... then after another month went back to what it was.. no wifi at night.. they tell me is busy at night so they cant do much about it.... so i pay full amount to hear they cant do anything about no wifi at night.. every single night no wifi.... and no attempt to fix it... i use whats app line and they almost never answer at night.. i cant phone every single day it cost so much to make calls to them...