Saving my indoor bamboo plants

I have two pots of indoor bamboo plants. But I’ve notice that the other one with the square pot, the stems keep on turning yellow and will die. So, today, before I will lose everything on that square pot, I try to transfer it in the circle pot. When I remove the stems from the square pot, my good, I’ve notice that I can’t pull the bottom part. When I check it, my goodness, it’s being tied with wires. And that’s the reason why the stems keeps on turning yellow and will die. So, hopefully, with this remaining bamboo stems, this will last longer. Or else, I will be buying another pot of bamboo plants but since I know the reason why it will die, I will have to buy a bigger pot and bag of soil so that I can transfer it! Hmmm!