What should we do if we have limited pages left in our passport while waiting for a new work permit in Thailand?

We need advice urgently. We moved to a new school in Bangkok. We had 4 pages left in our passport. We were on a work permit at our previous school. At the new school they took forever for our work permit and we had to travel across the border. Now we only have one and a half pages left in our passport. We went to the South African Embassy and they said they will give us a letter for immigration stating we applied for a new passport. We decided to move to a new school and will have enough space for the Non B and hopefully our new passports will arrive in time. My question has anyone been in a situation like us before?