Irate customer

I wrote on 10th about my data being suspended due to nonpayment Cell C promised to have the issue resolved but no today I called them again and the agent I spoke to advised me that the reference number I've been quoting on my payments is incorrect he sent me a totally different one.What shocks me is that the one I had was sent to me via WhatsApp by Cell C what does this mean for me,does it mean I've been paying someone's else account and who's fault is it mine? I've spent about R300 from Thursday buying data yet I've paid these people for data I've never missed any payment. Is this how you treat your customers with your rude floor managers cause I must say the manager I spoke to first time I called in about this was very rude and made sure it sinked in to me that I'm owing you without checking thoroughly