Did I received the wrong serum by DermaCo? Can someone clear this out ? Ps:- I am really confused .

Context : In October I ordered 2% kojic acid serum (10ml ) by DermaCo . And to the surprise I recieved the 30ml ...I dunno how but I just didn't thought about it much coz it was intact in the box and not used. The serum which I received was as shown in the pic (light greenish colour ) and it was like thick serum consistency . Fast forward to December....decided to order one more bottle of the same . This time I ordered 30ml but to my surprise the serum which I received was completely different from the earlier one . It's brownish not like the pic they have shown . And it's really watery . I decided to scroll down the review and in the reviews too some serum were green and some this brown. Which one is the real one and should I complain them ? What should I do ?