Telkom upgrade department

I have 4 accounts with telkom currently. For about 2 or 3 months they have been calling me on both my numbers probably about 3 to 4 times in a day. This is happening everyday even after I repeatedly told them I'm not interested in upgrading my contract. It now feels extremely annoying and I am forced to write to you. I am pleading for this to stop as it's interrupting my day and night and life!