Frustrated 😠 😡

Not happy with the way sales agent are handling complaint.i have been paying 450 for almost 5 months now the 1 that I was using was broken and we phoned them to cancel old 1 and re connect the 1 we paying 450.on the 4th I paid 460 but now they say m owing 420 m disconnected.must I must for something that is broken and not working?it's been 5months since I used the old but they say it active where as I phoned and canceled it .how can I pay for something that is canceled and not used ?reference number used for a call ***-i***3-i59 The 2 sales agents where not helpfull m not happy with Dstv services