Impaq education disappointment

Impaq/Optimi home school Impaq/Optimi home school. My son was with your school for 4 years. We never had an issue. We paid the deposit and the fees on time every year, every month respectively. We were refunded R400 after we paid a R8000 deposit and he was only in the school for one month. Their terms contradict their actions. I have requested a clear statement of why we were only refunded the R400 and to date have had no response. We even overpaid the deposit which was R6000. I want answers. I have emailed them numerous times with no response. I see that they really only reply to the complimentary messages on hello peter, mmmmm