Kia Sonet HTK Plus model with Sunroof - Mileage and All doors are having more gaps due to that Ant comes inside cabin always

Dear sir,
This is to bring to your notice that I purchased My KIA Sonet IMT petrol variant on **-April-****. From day one I found two major issues in my vehicle that are,

*) mileage
*) More gaps in all the doors, due to that ants are always coming inside the cabin.

I informed the same immediately after purchase within * to * days itself to the service Centre, they said ok we will check at the time of first service.

*] I given My first service on **-May-**, after service they said they verified the mileage and the vehicle gives around **km/l. This is fake information that they gave to me. Because after service my vehicle performance also reduced and the mileage also reduced then before. On **-May-**** I put **Ltr of petrol to specifically verify the mileage, when I put petrol, the meter shows that your vehicle will run ***km and at the time my vehicle was run total ****km (Ref. photo attached). today my display shows a running total of ****km and shows low fuel.

See ****-**** = **km only my vehicle runs for **L of petrol. If I take the lorry, that will give more than this mileage. One more wonder is, Yesterday when I took the vehicle it showed ***km your vehicle will run. But I drove my vehicle only *.* + *.* = *Km. After reaching home, when I verify the display it shows from *** to **km. I have driven only *km but for the *km almost ***km petrol was consumed by the vehicle.

I am a middle class man, If the vehicle performance is like this means how I can maintain it.

*] For the door gap, service people said it is common in all sonet. It means not only an ant, any insects can come inside is it right? today's photos and video of Ants inside the cabin attached for your ref.

Because of these two Main issues I am totally frustrated and I couldn't drive my vehicle comfortably and I lost a total of **Lakh (Total amount of My car value).

I need clear cut justification on these complaints as soon as possible. Otherwise I need to go to the next step.