I was turned back one year ago

Hi am a Kenyan national I had been a frequent visitor to Hongkong with many entries,last year around this same time I was traveling with my child about 7 months but I was turned back at the airport...they told me I need to come to Hongkong with entry permit I cannot enjoy the free voa privilege for sometime...it’s been one year I wanna go to Hongkong so bad please any links on how I can get visa I’ll appreciate thanks