No excuses or contacts have been given as most of the calls were messages left on their phone.
The fitters were instructed by the original company. The man from this company made a mistake with the measurements and a narrower cupboard had to be fitted instead,this meant that a gap of 7cm was left needing an infill piece.this piece was not fitted.
If the company are simply going to ignore you my suggestion is to stop trying to deal with this on the telephone and address all future correspondence in writing. Write to them telling them that unless they get this fixed within the next 14 days, you will get it fixed yourself and you will take them to the Small Claims Court for the cost of putting the job right and finishing it off.
They are in breach of the provisions of the Supply of Goods and Services Act for failing to finish off the job within a reasonable period of time or to do it with reasonable care and skill.
If they don’t respond to your letter then you can easily issue Small Claims Court proceedings for the cost of finishing the job by visiting the government website here
Can I clarify anything for you?