Sent phone to repair do I have to pay?

Depends on what exactly is wrong with it and whether its still under warranty or you have Apple Care+.

If it is deemed a manufacturing defect, and the iPhone is still under warranty, then you should not have to pay anything.

Other iPhone Repairs - Official Apple Support

iPhone repair cost

Repair pricing depends on the diagnosis and your coverage under warranty or AppleCare+. If your issue is covered under warranty or AppleCare+ and was not caused by accidental damage, there's no charge.

It would depend on what was wrong with the device, if it was still under warranty, and if the problem is deemed to be manufacturer issue or user damage. No way for anyone here to be able to tell you, especially based on the information provided.

Screen damage is not covered under warranty, it is considered user damage. Depending on your location, you could use the link here for an answer. iPhone Screen Damage - Official Apple Support

In the US, the iPhone 6s is $99 with Apple Care Plus, or $129 without.

What says you have repairs and service coverage? Do you have some other insurance coverage?

Screen damage is not covered under warranty. It is user damage and you have to pay. How much you pay is determined on whether you have Apple Care Plus or not.

That just verifies that you have warranty coverage.

iPhone screen repair costs

Accidental damage isn't covered by the Apple One Year Limited Warranty, but AppleCare+ covers two incidents of accidental damage with a service fee. You can also use our Express Replacement Service. Not sure if you're covered? Check if you have AppleCare+ by entering your iPhone serial number.

Pricing applies only to screen repairs by Apple. Apple authorized service locations may set their own pricing. A $6.95 shipping fee will be added if your repair requires shipping and isn't covered under warranty or AppleCare+. Fees are in USD and exclude local tax.