Terrible service from call centre

I have explained to the call centre and have been running around the past few days to do everything they are asking. They want me to prove my income, but I have explained to them every time that I don't have any income. My family helps me because I don't have a job at the moment.<br> <br> Their response was to increase my premium because my income is too high! How can zero be too high?<br> <br> I have been with them for years, even I don't have a job, I still struggle to get money pay them every month and I never pay late. Now they want to charge me more because I earn too much, but I'm unemployed.