stormiscoming
The fact of the matter is that, like myself, no one with more than 1500 hours logged on the A320 have been able to convert to an ATPL.
.. have you logged 1500 hrs on A320 under the MPL ?
Any regulator who has issued you the MPL will issue you the ATPL once you complete all the published requirements for the ATPL. When a country accepted the ICAO MPL; the regulator will recognise all hours flown under the MPL. GCAA & CAAP will do the same.
Hence you should have no issue ins converting your MPL to a standard ATPL once you have met the requirements.