Mediakee Redirection Phone Scam Internet

I am elderly and have avoided buying things through my phone.  However, I decided I needed to get an app from the Google Play store.  However, although I thought I was entering my charge info on Google Play, I somehow got redirected to the Mediakee site.  They got my info not Google.  When I saw their info flash on$19my screen, I immediately knew something had happened somehow and started checking my charge card regularly for fraudulent charges.

Five days ago, a fraudulent charge for $39.99 from Mediakee appeared on my credit card.   I phoned them and asked them to remove the charge stating what happened.  Instead they said they would cancel my account.  I said I had no account and wanted the charge removed.  They started a song and dance telling me to wait while they checked what they could do.  First, they would refund $19.99 not the $39.99 charged me.  Then after my protest and another wait, they said they would refund the $39.99.  I was not born yesterday and when they said they needed 7 days to do the refund, I was skeptical that it would not be forthcoming.  The only other time I was victimized, I waited and called repeatedly only to find my credit card dispute time had been exceeded so my money was gone due to being patient.  Never again, I am disputing this one but would like to know how they are able to hijack folks from legitimate apps so they get your credit card info instead of the intended site.  Beware!