Missed one month and my service is interrupted

I've had my contract with Telkom for almost 4 years, and spent a lot of money on my contract month after month since I had my contract, I have never skipped one payment since 2014 and still they have the audacity to suspend my contract for missing one payment when previously they just double debit me for the month I missed, I just find it unfair that they suspend it 5 days before my debit is supposed to go off and they not willing to see me through for a few days