The A/THR of the a320 neo v2 doesn't work or so I think

Hello, I’m new flying the a320 neo v2, I always use the Pmdg 737 but going to the point, the A/THR of the a320 neo v2 does not seem to work, I use the selected VS, in addition to always activating the toga plus the selected A/THR, but the plane simply does not follow the instructions I put on it, in addition to the fact that when activating the toga the VS stops working and the plane rises +5000 or even +6000, please explain to me how to make the plane follow the selected A/THR and the selected VS at the same time, greetings

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