I doubt that the courts will ever force the mother to move back to PTA - do not even bother with that one, in your case the child is 2 years old which make it extremely difficult to have removal access, specially 500 km away.
It does not have to be a 5 year battle that cost R500 000, I know in some cases fathers has spend that kind of money and still doe not have access, like in your case I doubt that you will get removal access if you do get it might only be for day time removal, there is no reason why you should have supervised access, unless you have a track record of violence, drugs ect which has to be proof in court.
The courts are a bit biased towards fathers and yes the courts give some fathers custody that is under 2 years old, I got custody when my son was 18 months and my girl 4 years old and yes my ex also tried everything in the book to get custody which led to me having to move 1400km away to protect me and the children, if our justice system was not so biased then this drastic move would not have to happen, but there is not much protection for fathers in our country.
An urgent application done using advocate and attorney which is not a trial could cost you about R50 000, this could force the mother to allow you removal access, I will ask for removal access to your place in PTA, but build in extra measures in case that fail, use a good attorney that specialize in family law or preferably a good advocate which your attorney should get, but you still has the right to ask for a different advocate than the one that your attorney use.
Build in things like she has to pay the traveling cost or at least half of it, you can have your child for at least 1 week every holiday until the child reaches the age of 5 then you can have the child for 1 long and 1 short holiday, parents should alternate easter and festive season, you have removal access every second weekend or at least day removal until the age reaches the age of 5, access should be overseen by a psychologist or a social worker just in case the mother refuse access of make up stories which usually is the case.
I can still give you tons of info, I suggest to read the divorce forum on healt24 for more info, there are a lot of other fathers in the same boat as you.