Replacement screens for clone smartphones?

You're not going to have much luck finding one unfortunately; clone phones either use LCDs made specifically for that model (all stock being used to manufacture these, no excess to sell as parts since there is little demand), or they use LCDs for older branded phones, where the ribbons are slightly modified (for example, this LCD looks similar to the old HTC desire HD era HTC LCDs.

Since the phone is likely quite cheap to buy, you would be better off buying a new one, unless you can salvage the LCD from another S7 clone of the same model (but beware, they may use different versions of the LCD).