it has cashback offer of rupees 5000 on HDFC credit card and debit card till 5th December

Dear A7 2017 does not come with features which A7 2018 comes with.The biggest difference between 2017 and 2018 A7 is triple camera A7 2018 comes with triple camera with 4GB ram and 64 GB internal memory.it has another variant with 6gb Ram and 128 GB...

currently A6 does not have any cashback offers

probably you have installed some bad apps they are creating ruckus in your phone go to settings then device maintenance Run Optimisation and check for virus I hope it will help

visit any service centre and ask for the price