Vodacom harassing clients

This is the second negative review I am.raising against Vodacom. Last week I complained about spam calls from Vodacom. I promised to cancel my contracts with Vodacom if they do not stop pestering me about upgrades. I was contacted and promised that my details will be removed from their data base. Since then I have received 34 phone calls from the same number: ***. I have blocked them but I am done with Vodacom. I explained to the caller from the number that I am not upgrading. This is pure harassment.