"I was told there was no trace of my request"

For a number of weeks I've been ringing the Respiratory Lab at Wishaw General to ask if I could go on the cancellation list for a Lung Function Test.

This is one of 3 mandatory test that Systemic Sclerosis patient should have annually. I was told on multiple dates that there was no trace of the request. 

On all these occasions I thought I was speaking with the same staff member, but later this staff member denied any prior knowledge of my enquiry. They told me that they were working on it right then & would call me back.  I got no call back, but when I rang nearly a week later, low & behold the request is there & has been BACKDATED 5 weeks. 

If a mistake is made there's no shame in saying so, apologise & move on but to change the details of what happened, that's unforgivable.  My experiences with Rheumatology at Wishaw over the last 18 months have been horrendous & hugely damaging to my mental health.  I feel irrelevant & worthless & have had to seek help from Samaritans. I need this treatment to stop, it's doing harm.