Homelane Interiors - 78 Days Delay in the handover

We have booked interiors with Homelane, expecting professionalism and punctuality. After a few initial rosy interactions and booking an interior designer was introduced who was 'not available' to discuss the details and requirements. The designer suddenly became responsive after my request for a change of designer to sales executive.
*. They tried to push the deal before March **st and were really behind us to close the deals even when a few designs were not sorted out.
*. We informed the designer that builders are providing the material and not fixing it and it must be in the interior scope.
*. On **th April we concluded the design phase and **th April **% payment as per the agreement was made. And on **th May ***% payment was made. As per the promise the work should be completed within ** days, i.e on or before *th June ****.
*. We coordinated with the builders and made material available. (Granite counter and the extra tiles were ready by *th June ****. Also a few things that were suggested by the designer to buy online (Wicker baskets) were also purchased in advance and made available to stick to the schedule.
*. Did not hear from anyone for a few days and on **nd June ****, after the builder’s’ call that the material is still not taken by the interiors, we got to know that apparently the fixing of granite is not part of their job (The people claiming end to end solution and have procured other accessories like Chimney etc); This was a total surprise for us.
*. Above that the designer to save the skin started saying that we never mentioned that builders are not fixing it. (Fortunately, I found the message in WhatsApp where I have mentioned that builders are ‘only providing’ the material.
False accusing to save the skin.
*. No one contacted us from **th April till **nd June regarding the same and the answers were vague.
*. On **th June after visiting the site they started mentioning that they will look for a local vendor and will get it done and then again, no reply from them till *st July
*. When we started to ask for the compensation for the delay, suddenly a suborder was raised again to save skin and avoid compensation. The prices quoted were about *.* times what a local vendor could do and then offered a sweet discount of **% just to show they care! When asked they started mentioning that it is for fixing the granite.
**. After a few attempts to communicate with them, On **th July they officially mentioned that fixing is out of their scope! It was not mentioned in the quotation and Yes! Since other all small things shown in the reference drawing were either included in the quotation or mentioned as prop, we never expected that the counter fixing is not a scope of their work!!
**. So, now we want the compensation for the delay for not including or not mentioning anything about the countertop in the quotation and delaying the project for ** days.
In short for Unprofessionalism