Hello Moerariq,
I hope well. Thank you for visiting this thread.
I am sorry to hear about the refusal of your application. It is my assumption that you put all these info in your initial application if yes, I am sorry to say there is nothing much I can do at this point. Please try to refer to my post on self assessment for study permit. Your profile is very high risk and you are unlikely to get a study permit approved.
1. Age: I cannot mention it enough on this thread. Age is a big factor in determining who gets visa approval. If at 40 you were applying for a PhD, your chances would have been much better, but for a graduate certificate, the chances are much slimmer.
2. Academic Progression: You already have a Masters degree in Economics and now you want to pursue a graduate certificate. The VO will not see any academic progression here and unfortunately would not be convinced that your sole purpose is for study.
3. Pension funds are not easily accessible as you may already know, until retirement age of 60 or 65. So the VO knows this. The VO is wondering that after 13 years of full time work experience why would you want to go and study for a graduate certificate degree regardless of its relevant to your current or past work experience.
I would suggest you order for your CAIPS/GCMS notes to see specifically the issues raised against your profile and try to address them accurately. I would also say you should try get into a PhD program, that will give you a better chance. Finally, the socio-economic climate in Nigeria now is very unstable, the growing political tension in the country is at dangerous and alarming levels. 3 of my clients were at VFS Lekki yesterday, and they spent the whole day there, because of the multitude of people who are applying to escape the country. This can only lead to one thing, increased percentages of visa rejections. The VOs are all aware of this, so any application that looks suspicious would be immediately stepped down.
I sincerely wish you all the best.
Omofar