Harassment from call center

I have 3 accounts at standard bank, I felt behind and made arrangements to repay them. On 2 of the account's there is no problem but with the personal cheque account there is a big problem . They phone every single day telling me that I must pay my account . They are making my life hell , it sound like a joke to these call center people . I maked many complaints at there complaints department but only to get more calls from harassment bank . ( standard bank)