[Resolved]  Eureka Forbes — bad taste of water even after servicing

We recently got out ro serviced which changed all cartreges and also charged 600 for service. Despite of all this water tastes heavy. When called cc she said your ro is not having uv so we cannot do tds control.
Its clearly mentioned on my ro that is is having ro
Model is aquagaurd classic with e boiling+.
Pathetic service. Need immidiate resolution