From the A330 FCTM, it says you MUST follow the RA even if above Max Alt
If a RA is generated:
• The flight crew must always follow the TCAS RA orders in the correct direction, even:
‐ If the TCAS RA orders are in contradiction with the ATC instructions
‐ At the maximum ceiling altitude with CLIMB, CLIMB or INCREASE CLIMB, INCREASE CLIMB TCAS RA orders
‐ If it results in crossing the altitude of the intruder.