I bitched at Playtech back when their pontoon implementation forced you to stand on a 4-card soft 21. They actually paid me.
I would keep pressing the issue. This is an obvious flaw in their "house way" implementation. Try contacting the following person, this is who resolved my issue.
Playtech
Iris Toledano
Marketing Director
+972-3-611-2417
iris@playtech.com