How to disable powerbi desktop loading new data while loading from api

Hi I am sorry if I have confused you..
Person A is a client and person B is vendor who actually creating this report.

Now when vendor creates and send the pbix file to client the client, the client should not start loading next onwards as this will be a loss for the vendor.
Assume if it is a monthly study and the data uploaded to API on monthly bases. if the client gets the pbix created by vendor and will start loading the new data from next month onwards.
if that case occures then it will be a loss for vendor.

Now lets understand thru data level.

while new pbix for perticulare study been created, then the survey data count was 500. now the client on monthly basis added new data to API on 150 each month.
then the each month vendor can load the new data and send the report to client. now the pbix is been directly sent to client, the client now himself will have this data refreshed only monthly bases.
instead this i want the client only refresh the data for the 500 records which was initially updated (incase there is a revison in the data only). and do not load the new data

Hope i am able to clarify.