Job application

I have recently been informed of a potential vacant at my current employer. I have applied for this role, which is decided by HR.

My concern is that the will reject me, or find ways to reject my application because they do not want me to have the job. They have form on this. I applied for a role previously of driving instructor and assessor. I was the most qualified candidate for the role. I am registered with the DVSA and can instruct and assess any large vehicle - buses, coaches, rigid lorries and articulated lorries. Eventually, the job was given to an unqualified driver whose only experience is none. They are not qualified instructors by just normal drivers. Whenever I asked f about further jobs, they said there was none for the foreseeable future. I then find out that, yet again, they offered it to someone unqualified.

Now a new role has come up called "driver manager." The job entails skills in assessing, reporting, identifying areas of weakness in drivers' driving standards, educating new drivers and corrective training, everything I am more than qualified to carry out. No-one applying is as qualified as me. I know this because the ones applying are, once again, just drivers with no experience relevant to the role.

When applying for the previous instructor role, they informed me I missed my interview. This was a lie because I looked for any previous correspondence: e-mails, missed calls, voicemails, text messages, letters in the post; there was no offer of interview. So, I know they just looked for a reason to say no. When I said can I re-do the interview, they said the role was closed. It was not. I know this because my friend who eventually got the role, was away on holiday at the time. His interview was when he returned, after they told me it closed.

How can I proceed and prevent them from discriminating against me. I am way more qualified than anyone.