harrasment by ok furnitures

My boyfriend and i bought sony music system and double bed from ok furnitures.we pay every month but every month they send their people to come and reposes the goods and send smses saying we are 2000 rands in arrears.i feel very harrased and humiliated by this behaviour coz people are starring and everytime they turn back but only to come back again the following month. A lady called natasha even went on to saying even if we are not home they will come with the sheriff and break in to recover the goods.