NO ONE ANSWERS THE TELEPHONE!!

I CANNOT GET HOLD OF ANYONE ON YOUR +***0 NUMBER, OPTION 3 FOR BOOKING WITH AN EXISTING VOUCHER. I HAVE WAITED FOR HOURS AND HOURS OVER THE LAST 30 DAYS AND STILL NO ONE ANSWERS THE PHONE!!! THIS IS NOW BECOMING EXTREMELY FRUSTRATING AND VERY DISSAPOINTING TO SAY THE LEAST. WHAT MUST I DO TO GET HOLD OF A CONSULTANT BRITISH AIRWAYS??????????????