Harassed for upgrade ending in cancelation

I have been with Telkom for quite some time with multiple numbers in use, now my one sim is up for renewal and this is a spare data sim which i seldomly use, the last few days i have been harassed for an upgrade as i had up to 6 calls a day for the upgrade. I have asked that they stop calling me with no avail, i have this morning after yet another call for upgrade gone and submitted my cancelation, i would rather keep a pre paid sim than having to go through all these calls during a day. Over all i have no major issues with Telkom mobile but also want to ask that they do not send my bill to all my numbers.