IMPOSSIBLE TO ACTIVATE INTERNATIONAL ROAMING FOR CELL C BUSINESS CONTRACT?!

Dear Sir/Madam. Could you please activate below phone numbers for international roaming? We are really struggling last 3 months to activate INTERNATIONAL ROAMING for our contract numbers. We would like all the below numbers to be able to receive calls and SMS and make an outgoing call in OVERSEAS. *** *** *** Currently, *** can receive calls and SMS but can not make CALL. *** cannot make any call or cannot receive SMS *** cannot make any call or cannot receive SMS Your urgent response will be appreciated. Kind regards. KRISTAL CONCEPT PTY