Mistreated by employee

HelloPeter I'm writing to you to find clarity on something, I can write the whole 4 pages but what is frustrating me is they send people from the shop to come and harass me at home and at my working place. Telling them that I don't pay my account I took bed from them, even now when I'm speaking they are at my working place. The thing is I bought 2 double bed from them last year and within 2 months I reported that their bed a making nice and the springs are coming out. They never get back to me after 2months they started demanding money that I must pay, so I told them why can't you attend to my problem first its then that I can come and pay. Still no answer its then 1 of the manager she's a woman called and say WHAT WAS I THINKING WHEN I BUY A R3000 BED? WHAT DID I EXPECT WILL HAPPEN? I got angry and keep quiet then they send a man again he came to my house and say hes not leaving until I give him money. I locked him outside then he left it was December. So towards monthend a bakkie came with 2 slumber bed they say they came to change the bed and I asked them how because they told me that they will send people to come and inspect it first it's the that they can confirm what I'm saying. So I can able to buy the 1 with higher amount like she have said. So they say we are not leaving until we exchange , that's when I let them in they change it. Immediately within 4 days another man came said hes here to take money and he won't leave until I give him, what I asked him is how are you guys operate, do you know that they just changed the bed without my knowledge, he said no I dont know and I dont care. So I left him at the gate. Then I contacted them and lay a complain which is they always not note it down I told them them those bed the are springs hurting me when I'm sleeping, they said they dont have my time. So I decided to not pay also now we put too many blankets on top of the bed to reduce pain. For them all they want its money. Myself now I need to buy an expensive bed because the manager said to me what was I thinking to buy a cheap one, they should have advice me the day I was purchasing that this 1 you will suffer. So now I'm scared about my safety because they was this man is aggressive when he speaks to me and comes into my home and working place to make noice and inform people that I'm owing them. I need clarity should I open a case of harassment or what should I do