Absa credit card stopped for owing R121 rand for 1 day.

Absa Bank have stopped my credit card, without warning, because I owe R121 (one hundred and twenty one rand), not thousand, for one (1) day. I have thousands of rands in my normal bank account with them and have had these accounts for years. They now hound me 4 times a day for the money, which has already been paid. How pathetic!