Call center calls

I did not pay my account for this month only. My account is up to date and I have never missed a payment. But I have been called day and night for the last 2 weeks. And I received this message today( You have ignored our smses to pay R1025.00 on your Mr Price account, your account has now been identified for Tracing.Pay TODAY to stop this process.) I am going to close this account month end. Can you please stop calling me..