Air India — Wheelchair not provided

Address:

Kheda, Gujarat, 387001

My air india booking ref number is z7xl6.
Which is for my relative mrs vilasben patel. Who is not able to walk so we make wheelchair at booking time.. At the ahmadabad airport ai provide wheelchair but at london airport newark airport ai staff doesn't provide staff so she face many inconvenience. When we ask at the airport that why you dont provide wheelchair they said that mumbai airport is not allowing you.. But when you give us wheelchair at ahmedabad airport then why not given at london airport and newark airport.. They not accepting anything.