Thank you. My main concern here is the lack of anything official which guarantees you the increase in pay as soon as you get a new qualification. Ideally, you would have wanted a specific term in your contract, or an official policy which states that the pay will automatically increase when that happens and there would be no doubt then of what you could have expected contractually. Also, the employer’s failure to follow that would have made it a breach of contract.
What you are relying on here is a verbal promise which was not in any way confirmed in writing officially and to legally challenge them over it you will find it riskier than if it was a specific clause in your contract.
You can still try and argue that the verbal promise were of a contractual nature but only a court can decide if that is the case. Instead of going down that route, I suggest you pursue it with the employer internally, such as through a formal grievance.
You can get a detailed explanation of the grievance process here:
In summary, an employee is expected to submit their concerns in writing and send them to their line manager, or whoever is nominated as the person to send grievances to under an official workplace grievance policy.
The complaint should include details of what the grievance is about, any evidence that may exist which is relevant and also what the employee wants their employer to do about this issue.
Once the grievance has been submitted, the employer is expected to arrange a formal grievance hearing, inviting the employee to attend and discuss the nature of their complaint. The meeting is also as an opportunity to ask for further clarification or information, as required.
Following the meeting, the employer will take time to consider all the issues and evidence and then make a decision, communicating it to the employee. If the outcome is not to the complainant’s satisfaction, they can appeal and get a second opinion from a different person assigned by the employer to consider the appeal. Once the appeal is also completed, that brings to an end the formal grievance process and there is no option to escalate it further internally.