OnePlus India — charging disconnection oneplus 7t 256 gb mobile

I am describing my problem loud and clear.. That..

When my phone charge reaches to 18 to 20%..
Step 1* i place my phone on charge..

Step 2* warp charging logo flashes..

Step 3 * charging begins.. With thuder symbol near battery.

Step 4 * i leave the phone for charge and go on with my usual work..

Step 5* i come after 30 to 45 minutes to pick my mobile.. Mobile not charged.. It is still at from 18 to 30% (Now a days. I check with 3 to 4 minutes.. Same problem..)

Step 6 * i abuse myself and then the youtubers and the brand,, then restart my phone...

Step 7* phone restarted now again charge my phone,, warp logo comes and charging begins.. I stand near my phone for 10 minutes.. To check wether it is charging or not...

Step 8 * after one hour charging completes..

This the actual shedule.. I am doing daily for nearly three months..

When i mail customer care,, they teach me some programming and tell me to do as per advice,,, by their bug hunters.. And tell me to wait for 48hrs,, like this i have waited for near 11months and no solution...

Because of this.. I feel to hurt my self by getting this device..

I beg your pardon please take your fancy oneplus 7t back and return my money,, my blood boils me becos of this,, oneplus 7t will hurt me or kill me...

I dint pay my 40k of my hard earned savings for this faulty device...

I again i beg your pardon please take your fancy oneplus 7t back and return my money,, my blood boils me becos of this,, oneplus 7t will hurt me or kill me...