Great Eastern Appliances — AC installation issue by VOLTAS and Great Eastern

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Great Eastern Behala,kolkata and Voltas AC installation section

During purchase of AC machine detail information provided to them as 9th floor and outside window the external machined needs to be fit in.I asked them let us know if there is any concern .
They did not tell anything, but in the recent past before installation they told without cutting window grill they can't install AC machine at the last moment.This has caused a serious problem for me.
If it would have informed during purchase I could have taken decision accordingly..Now my interior colour etc has been done and further modition to the grill may lead s to huge additional cost.
If I would not receive an acceptable solution I may go ahead for a legal step.
Regards