Hi I tried calling the Shanghai Pudong Airport Transit Hotel for International passengers

Did you add 86 before the number? It stands for calling a China number. If it still doesn't go through, here is the hotline of PVG: 86 21 96990. Ask them about the Transit Hotel thing or directly ask them to transfer to the hotel.

If it is hard to get the precise info, you can also consider the Dazhong Airport Hotel, which is located between T1 and T2. You can directly walk there after landing. Their number is 86 021 51801133.