EXTREMLY POOR SERVICE AND NO RESPONSE

HI I HAVE A ROUTER FROM NEOTEL EVERY TIME WE COME IN WE CANT NOT CONNECT TO INTERNET AND EVERY DAY WE HAVE TO OFF THE ROUTER AND ON IT TO CONNECT TO INTERNET AND THE SPEED IS EXTREMLY SLOW AND THEY BLAME IT ON HIGH VOLUME USE BUT IT NOT THE CASE BECAUSE EVEN IF THERE IS ONR PERSON IN THE OFFICE IT STILL A SLOW SERVICE I HAVE BEEN HAVING PROBLEM WITH THEM FOR ALL MOST 3MONTH NOW AND WE PAY ON TIME.