Toyota — Improper service

Address:

Ceekey House AR Nagar. Malappuram

I had made 50k service, of my platinum etios 2016 December model
KL12 BE 6021. From Amana toyota calicut. On 2020 may 25.
Now after 3000 km the vehicle showed the *engine oil shortage signal*,
I immediately contacted the same service personnel who attended my service. He adviced me to just top up the oil and continue and said that it's common for all the new Toyota vehicles past 2017.🤔
I went for a top up and added 3 litre of engine oil, that means it hardly contained 900 ml of oil in the vehicle... I strongly believe it is related to the improper service of the last service, rather the misqualty of the Toyota company.. Take immediate actions to get me proper advice and service of my car