Customer service from Vodacome

I think that their customer service is unprofessional, impolite, and rude. Every day at 9:35 I receive a phone from this number ***. They insist on talking to ********, and I keep telling them to phone his number. Today I confirmed with the rude person who was laughing while I told her to keep quiet while I was talking she carried on laughing and before she laughed she confirmed that they do have ****** numbers. I can't block this number, they find all loopholes to contact me. Teach your customer service employees manners how to deal with public.