The Professional hunter is sometimes a bit of a tour guide. However he is a Professional Hunter and not a professional shopper. It's one thing to head into a town for an afternoon or eventing to let the folks shop and browse, it's another to end the hunt 4 days early and then expect this as a full time event for the remaining days. It's also very expensive to use a PH as a cab driver or errand boy. My suggestion would be to continue hunting for one more exceptional trophy. If you see it great if not then nothing lost, as you were paying for the PH anyhow. Lets look at this another way. You came all this way to see Afrcia and hunt. So by the time 5-6 days go by and your finished hunting is that the extent of your interest? Most folks spend the remaining days hunting just as they were, but maybe for a special huge warthog, impala, or some other affordable game animal. It keeps you in the bush and actively hunting. I have had a number of guys come across the biggest trophy of their lives when hunting with lesiure rather then the anxious anticipation of the first few days. Most places will take a credit card should you happen upon this massive trophy of a lifetime.
In my Zulu camp we are so close by the park that the PH would love to take you for a drive all day as much as you like through the park, A much better option then taking you back to Pretoria or Joburg for shopping! At our Limpopo camp we can go fishing or hunting along the river Where you can see across to Botswana and one never knows what will show up by that river! There are lots of crocs and other game in the area. Lots of options if you should finish hunting early.