Debit order

Got home last night and dstv was off. <br> Went into self service on Internet. Got a surprise outstanding balance very high amount. <br> Phoned call centre and was told that I must check that account is been paid. <br> Why did I not get a phone call when 1st unpaid happened. <br> I sent up payment on self service Website. This is not the 1st time I ha e had problems with debit order payments. <br> I need answers and who is going to pay for my phone call for 20 minutes to call centre from my cell phone.