Xiaomi India — service centres worst performance

Firstly they told me to wait for 1.5 hours and after then for 2 more hours and at last after wasting my 4 precious hours they said, "sorry sir the parts required is not available with us. So you will have to collect your phone after7 days". The service centre does not have parts available of the phone. Due to this they retained my phone for a week. And after asking how will i manage for a week... They replied sir parts is not available so you will have to manage anyhow.. It's your problem we can't do anything..