Yes. Interest tempore morae, or as its more commonly known; mora interest, is the interest charged when a payment is not made timeously, and an interest rate has neither been agreed between the parties nor is it prescribed by statute.
Mora interest is a common law right, meaning that it automatically applies to contracts unless it is expressly, plainly and unambiguously excluded by agreement between the parties. If a contract or agreement is silent on the rate of interest, then interest can be claimed at the prescribed rate in terms of the Prescribed Rate of Interest Act, 55 of 1975