Apple India — App crashing and automatically turned off

Address: Visakhapatnam, Andhra Pradesh, 530026

To Apple customer service centre I bought mobile in March of this year from starting to till now I'm facing app crashing issue from last 2 months I went 5 times to service centres when I went to service centres they reboot my device and they installed software and give to me back and 2 times I submitted my device in 3 days at service point after 3 days they observed my device n give it to me back then also I'm facing this same issue at finally again on this month 11 I submitted my device in service point they replaced my device n gave me a new device on this month 23 but main problem is the new device also same app crash issue n the device was automatically turned off Apple selling worst n outdated mobiles to customers I'm not satisfied with Apple iPhone I won't support anyone to buy apple products...