Spam calls

I have multiple contracts with vodacom. I have always been very happy with their service. How do they repay me? By spamming me with 3 to 4 calls DAILY from their call centre. Vodacom has excellent service through multiple platforms; app, website, call centres and walk-in service centres. All of these give excellent service when you reach out. Why would they then punish me by spamming me with call centre calls? I know how to reach them. As a loyal client for over 20 years, ahould i concider a different provider to escape the cheap and desperate marketing?