Non-existent service in Northcliff - AND then you want to sell me more of what doesn't work.

So I have repeatedly complained about the extremely poor cellular service in Northcliff. ALL our neighbours have the same issue, but Vodacom continues to wipe their rears of on me. BUT...... to add insult to injury I get a call from a schmarmy call centre agent all rehe****d (and very professional sounding). She tells me that Vodacom has earmarked me as a fantastic client who has never ported and never been delinquent on my contract, so they would like to sell me yet more services - a PC with a router etc etc etc. The agent was rather peeved when I said NO THANK YOU. Please check my records and see how much I have complained. Please ensure that you mark my account as - PLEASE DONT CALL AND MARKET ANYMORE SERVICES AS THIS CLIENT IS ALREADY DESPERATELY UNHAPPY WITH THE CURRENT STATUS QUO