App Building

we need a basic app location base app state wise of india of appointment booking for mobile repair and also buyback of mobiles, so customer log in thru OTP, book an appointment of mobile repair and also be able to sell there old mobile devices, the data of repair prices with price and model will be provided buy us in excel sheet and app should be able to update the same thru excel sheet only Same goes for customer selling there mobiles how much we can buy and what model we are buying based on conditions, soce, ram, brand etc will be provided to us in excel sheet to be uploaded on app thru excel only all back end data of app like mobile repair price model, color, brand, gb, storage wise will be uploaded thru excel all buyback data of app like customer who will sell there phone to us will be uploaded thru excel from the back end by us on regular basis bases on brand, color, storage, ram, condition by us customer should be able to make appointment only thru app to book appointment related to repair or selling there phone to us with live tracking of rider from our office to customer location or rider location to customer location the complete project involve data of app building, backend, registering us on apple and android platform and giving us back end for the same