Constant unsolicited calling for upgrade sales.

Unsolicited calling for upgrade sales. I have 5 contracts with Telkom. Imagine getting called five months for notification of upgrades and incessant sales. Please stop this. It is unsolicited. I do not want to be contacted about sales or upgrades. I do not want any of my cell numbers to be used for sales calls. My one number received 8 calls in one evening for sales. Please stop.