lack of service or timeframe of promises

I booked my phone in for a new battery following this battery replacement program was told 7 - 10 working days was told I need an new phone and quoted higher rate than once can purchase phone When I said just replace battery was told wait for quote. 4 days later Day 11) an email with no quote arrives I reply saying replace battery as requested. I still on day 11 have no quote and have been told they out of stock of battery. WHY BOOK A PHONE IN FOR BATTERY REPLACEMENT PROGRAM WHY MESS A CUSTOMER AROUND LIKE THIS WHY SELL A NEW PHONE WHEN ALL THAT WAS ASKED IS BATTERY MY BATTERY IS NO LONGER LASTING