SARS default in their assessments.

I found out that they forgot to enter my tax for 2015 on their review version of my 2015 return. I owed R4000 before that now I owe R55000. I think it is unfair of someone that is honest to pay so much. My wife has a similar problem, where they forgot to put in the Medical details, she is paying R3000 a month for this out of her salary. I hope that someone can help us with the problem.