Paying insurance means nothing

We purchased a Slumberland Omega Queen bed an base set from Lewis Bronkhorstspruit , plus minus 3 years ago. We were forced to take insurance on the bed as we are still paying it off. From the first night we slept on the bed the springs started popping, we complained about this and we were told the bed would be replaced, since then we have gone back to the store and complained every month, but it seems as soon as we leave the store they forget about the complaint or couldn't be bothered, but we are forced to pay every month.