WORST NETWORK EVER

WORST SERVICE EVER. LAST MONTH THEY SAY MY ACCOUNT IS OVERDUE AND VLOCKED MY NUMBER BUT I HAVE NEVER MISSED PAYMENTS. SORTED IT OUT AND NOW AGAIN THEY SAY IM IVERDUE AND I AM NOT!!!! NOW THEY BLOCK MY NUMBER AGAIN......I am going to cancel my contract!!!! WISH I CAN SUE THEM FOR DOING THIS AS I AM NEVER IN ARREARS WITH MY ACCOUNTS.