Poor Service from Telkom Call Centre

Telkom Mobile Call Centre Agent tried to sell additional products to me today and when I explained I have had poor network service from Telkom he dropped the phone. They have been calling me numerous times during my working hours from ********** and when I finally picked up the phone the agent decided to drop the phone on me due to me sharing my dissatisfaction.

Should you not first listen and then try to sell later or is Telkom more focused on getting more business and no longer customer service?