"Feel the support is lacking"

I am a home haemodialysis patient under the care of SATH home HD, I have had a few issues with my dialysis machine over the last few months resulting in the renal techs having to attend my property.  I had a serious fault on my machine a few days ago and 2 renal techs came out to identify / resolve the issue, I was told the machine was OK and it was completing a heat disinfect program then it would shut down.

When I used the machine the next day a button on screen for taking a BP was missing, I reported this to the tech team at SATH and an engineer was booked. I completed my session with no problems and the techs arrived shortly after, 2 techs arrived and they could not access the machine software as their card when inserted in the machine did not register so they had to leave to obtain a working card. When they returned they spent some time trying to resolve and in the end a part was identified as being fitted incorrect inside the machine.

A lead was plugged in with 1 pin bent or misaligned, the one tech said what it was and I asked the other if they had unplugged the part on their previous visit, they assured me this part had not been removed or refitted on previous visit, the first tech said it must have been like this since I had the machine yet until the previous visit I had used the BP cuff on the machine pre and post dialysis for over a year and it was not until the previous visit by the tech did it disappear. I found the tech very rude and adamant it could not have worked in its current state and they would not take my point of me actually using it 4 times a week for over a year.

I understand the NHS are short staffed and work extremely hard but to behave like that in my home is both offending and insulting.

I have refrained from reporting the issue as I am hoping the member of staff was having a bad day, but it will not allow a repeat performance.

First bad comment I have had to make about the renal team but I feel it was disgusting behaviour. 

I need to have confidence in the machine as well as the support network that allows home hemodialysis, I save the NHS a lot of money by dialising at home rather than in hospital treatment, at the moment it feels lacking