without being on site to see what is happening and what the plan is, it is difficult to comment.
however from the pictures you have provided it would appear that there are several things wrong with the installation.
these include connections that are to be permanently hidden that may not be suitable for the job.
cables that have been surface mounted but may well be plastered over have not been capped (covered to protect from damage caused by the reaction between plaster and pvc cable)
cables that have no secondary insulation ( it is not acceptable to have the brown and blue cores showing, it should be going into all the sockets etc. still covered by the grey outer sheaf)
I would ask the people who ordered the work to come and have a mid work appraisal of how things are going and follow this with an email or letter, detailing your concerns.
once they realise that there is a paper trail that can lead back to them, they will be more helpful in dealing with your concerns.
email is great, because you can add the pictures so there is no confusion.