It's not so much the dog doesn't listen, more that he doesn't understand what you want him to do. Go back to basics and don't punish him when he toilets indoors. Double your vigilance and take every opportunity to put him outside to toilet. The crucial thing is to be present when he does toilet in the correct place, so that you can reward him. This makes him keener to repeat the performance to get another treat. Conversely, if you have been telling him off for indoor accidents he may already feel inhibited about going to the toilet in your presence, including when he goes outdoors. This is one reason why it's important not to punish for inappropriate toileting.
Taking the learning from Stages 1 and 2, we now test the dog within a public environment with real life distractions. This period can be the most challenging for the dog. Using a range of public locations we train the dog to utilise learned behaviours.During Stage 3 we expect the dog to work on verbal commands only, asking for a higher level of obedience. The training is still fun. At this stage, we have usually exchanged the food reward for a toy. Can I send my dog away to get trained?