Dude stop stressing about that bit. He gave government an interest free, short term loan and is only getting it paid back now.
My returns have been small too, even now just like R900.
But next year probably somewhere just over R10 000. But that's because I'm putting R1000s more since last month into a Retirement Annuity (the allowed tax deductions on retirement funds was increased to 27.5% from 1 March 2016) and I had previous over contributions (I paid more than I could deduct with the old system) rolling over each years since 2013.