CHARGING A MINOR FOR OVERCROWING IN A FLAT UNIT

HIE MY NAME IS MUSA, I STAY IN KEMPTON PARK AT A COMPLEX CALLED JEAN GARDENS UNIT E4 , 4 THISTLE RD.I MOVED IN A 1 AND HALF FLAT UNIT WITH MY WIFE AND MY 2 KIDS. THE FIRST MONTH I WAS IN THE FLAT THEY ASKED ME IF I WILL BE PAYING 700RAND FOR OVERCROWDING AS MY SON WHO IS 2YRS 8MTHS IS OVERCROWDING THE IN THE FLAT AND I NEED TO PAY THAT FEE, SO I REFUSED TO PAY THE FEE AND TOLD THEM I CAN'T PAY THE FEE BECAUSE I FEEL LIKE MY SON IS STILL TO YOUNG FOR HIM TO BE CHARGED OVERCROWDING AND A WEEK AGO THEY SENT ME AN INVOICE SAYING I OWE THEM CLOSE TO 3000RANDS FOR OVERCROWDING AND THEY WENT TO THE LEVEL OF SWITCHING OFF MY ELECTRICITY IT HAS BEEN A WEEK NOW AND I TRIED TALKING TO THEM TO SWITCH IT BACK ON BECAUSE AM UP TO DATE WITH MY RENTALS , ELECTRICITY AND WATER BILLS BUT REFUSED AND SAID I SHOULD PAY THAT OVERCROWDING FEE, AM STILL REFUSING BECAUSE AT THE SAME FLAT I HAVE A FRIEND WHO HAS A BABY WHO IS 6 MONTHS AND STILL CHARGING HIM AN OVERCROWDING FEE, HOW FAIR IS THIS AND PLEASE TELL ME WHAT STEPS I CAN TAKE??