Sorry but this is for community support, not official support. Try to reach out to Samsung support.
Please start using punctuation and autocorrection; the text is really hard to read.👍
I totally understand and appreciate you feel disappointed that the phone wasn't repaired within the time frame given.
Unfortunately if a part isn't available at that particular Samsung Service Centre and there isn't a local Service Centre they could borrow one from then this can delay the repair.
The member of staff should really have contacted you to ask for your authorisation to send the phone away in my opinion.
I'm sure the manager will offer an apology.
I don't know about your area but just to point out Samsung also offer a Doorstep Repair Service.
I appreciate your Granddaughter is upset at not having the phone back when she expected it. These phone's keep us connected with friends and family.
Perhaps she could ask family or friends if they have a phone sitting in a drawer she could use in the interim.
It maybe beneficial to think about a good quality case and screen protector for the phone once it's been repaired.
I wish you all the best with this.
Current Phone > Samsung Z Fold³ 5G.