Medlife — modified the order of 1192/- without informing me to 464.25 and customer harassment

I've booked order of 1192.75/- (1000ml figaro oil, 1kg patanjali honey, 25ml dettol santizer)
I have maid payment using 600 as coupan code and reamaning with card via paypal as gateway. Now my concern is that they modified myorder to 464.25/- (200ml figaro oil, 500g patanjali honey, 25ml dettol santizer) withouting intimation me and my concer. Now when i called they are saying this is our policy. We will refund the remaining amount.

So is it the right the if customer is asking 5 mg medicine and you will modified it to 10mg even without taking customers concern.
Now because of you i have to bear 600 loss financial loss and the oil which i getting in 175/- (By ordering 1000ml) will get in 288 with your modified order of 200ml). Their is noting my mistake at all. Still as per your your fake and cheating policy i have to bear total loss.

Now my request from you is to either provide my medicine which i order without any refund or refund 1192.75/ plus my 600 coupon which will be wasted because of your fake provision and policy.