Dog trainer in the North

Hi, I adopted my dog almost 4 months ago. He is now 6 months (rough estimate by the vet), howver, we have no idea what type of mixed breed he is. He was abandoned on the beach during the cyclone of December 2017 and was taken care of by a foster family until we met and adopted him in February 2018.
He is very much an inside dog, never tied, sleeps inside the house and is already house broken (he sits in front of our front door whenever he needs to go do his needs, that's our cue). He is not aggressive, he might bark but is a scaredy cat if you try to approach.
We do not have much of a problem with him except that he has a serious case of being too spoilt. He can get jealous if any member of our family plays with another dog. And most of the  time does not come back when we call him by his name (he'll stop, look at us and then continue his way in the garden).
We need a dog trainer to fix these issues before he gets too old.
We live in the North (Grand Bay) and have been recommended many trainers in Curepipe or Rosehill. However, they are too far for us.
Thanks.