Firstly, I found that people from overseas are allowed to vote in this competition and there were other footballers from other countries.
I also looked into it by googling the term 'Vote for Banda'. I found a number of facebook and X campaigns encouraging people to vote for Banda from TR Sportzm - the 'Home of Zambian Football'. On Facebook for example, they promoted it multiple times and they have 119,000 followers. They also promoted it on X. They were persistent, including when Banda was in 4th place on 6th October (a woman from Barcelona was occupying the top slot at that point) . The same organisation has promoted Banda for other awards too.
Banda got support elsewhere as well - for example, a public figure called Linda Kasonde on X, who has over 37k followers and encouraged them to vote.
In one sense, you can't blame 'The Home Of Zambian Football' for promoting their own. Would love to know whether English Football promoted the 2 English candidates, or indeed, what support they had from their home teams, public figures etc.
I do also wonder why we are paying for this rubbish from our license fee, and who it was in the 'expert panel' who decided to include Banda in the first place.