Eureka Forbes — irresponsible behaviour for customer code# [protected]

I bought a ro (Dr. Aquaguard genius utc) in june-2020 and it was installed in 2 days time. It was working fine and i used it for 2 days and switched off the machine as i had to go to my hometown for a death. After a month i came back and i started but the machine is responding.
I registered a complaint and the service engineer attended and told me that the unit is working fine only the fr component is getting blocked initially and then it started working properly. So he adjusted to put the fr component outside the ro unit with my knowledge. He told me to use it for next 2 days and it will become working well automatically.
He started the unit and he left, but the time taken to fill the ro water in the storage tank is 3 times more than the usual time. I checked it for thrice and i got the same result. I reported the same to service engineer and he advise me to use it like that meanwhile he will check with his superior.
Next day he called me and told that he discussed with his superior and they advised to change the membrane filter to avoid fr getting blocked.

I got doubt about the product because previously i was another different ro unit and i never face such problem even if i didn't use it for 1 month.
So i called up to the sales person and inquired the same and the sales person told he will get back to me. It is almost 4 working days gone, still i don't have any reply from the sales team and even if i called, there is no response, not even picking up the phone.

Now i'm too much worried about the money invested in this product. I brought this because i have two children aged 8 and 3 and they will get good ro water. But now i'm buying water cans daily with additional cost.

I request you to kindly take necessary action and if the product/unit is to be replaced please help me to replace this.