it is also good practice to put some metal shielding in front of the cables, behind either the bonding or plasterboard. You may be able to straighten the cables on the lower picture by moving the pattress box behind over to the left slightly.
did a six year old do that? What a mess! I'd be peeved if a tradesman left my house in that state
Ive got some in my shed made by silver line only cost low 20s and do the job fine, you only need the single socket cutter, when doing a double socket just use it twice joining the holes together
Get a professional next time and it wont need that much repaired, if thats their standard of work how do you know the wiring is safe ? They are clearly not an electrician as the wirings not even run correctly in the wall. However as mentioned above, cut a larger sqaure around it, get some plaster board and adhesive, cut board to size of hole and cut out socket holes then slot it over and skim with plaster
Part 2 below