Ackermans will call 100 times for R64

Have had an Ackermans account for over a year now. They will call at least 10 times in the day from ll different numbers because you paid a silly amount short. Really????!I paid R64 short and had a lady call me telling me no payment arrangement was made. They received a payment which is better than nothing. They will harass you by calling you and next person of contact. ****** ridiculous!!Would they prefer debtors that don't pay at all?