Harassment by Lancet

I received an sms on 8 July 2021 notifying me that I owed a sum of R90.90. This was the very first time I was informed about this. The next morning at 8.15am I get a call from Lancet wanting to know when I will be able to pay this amount. I would have appreciated a call at a week later but getting an sms and receiving a call the next day borders on harassment. I have vowed never to deal with Lancet ever again.