Barrhead Travel Service review: booking ref 6198747

I am a long time customer of Barrhead Travel, I recently returned from a three week stay in Tenerife which was booked through Barrhead.
There were a number of issues which the senior Tui representative contacted our Barrhead contact (Nathan Wilkie) about during our break.
On our return I e mailed Nathan and requested transcripts of our discussions prior to booking and copies of his notes. I have now sent three e mails and have not even had an acknowledgement. I had a missed call from a Barrhead number but no message was left, an in any event I asked for electronic communication.
The reason I have been a repeat customer has been the quality of service and the helpfulness of the staff I have dealt with over the years.
I would like to make a formal complaint regarding the failure to respond to a legitimate request within an appropriate timescale. I also formally request the information I asked for be provided.