Tata Motors — tata tiago engine oil worning regarding

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Tata tiago diesel 1977 model regd no ts 10 el 2471 after second free service by concord motor s at 7500km by
Santhnagar hyderabad br found engine oil on floor. Symtom noticed was engine wobbling.. Ondetailed checking engine oil was lower than dipstick. Oil was not coming on dipstick. It is not understood why the worning lamp was not continued to glow and no alarm came as mentioned in user manual. There is no temperature gauge in the vehicle.
Please clarify.