POOR SERVICE FROM SUPERSONIC

i have notified them regarding the speed of the network being very slow,sent email with several speed test,they recommended to carry out some functions which i did and informed them it is still very slow. i receive email after +-8 days referring to the ticket closed(Ticket # [SST***] has been closed client says he rebooted router and everything and did speed test but he is still not getting the speds he is paying). true i am not getting the speed i am paying for. i tried calling them today the phone just rings, no response. please assist. regards ahmed.