Vodacom Technical Support

For the last two months, I receive calls from the same two number, but each time it is a different person. I believe this is some variation of crossed lines. I phoned vodacom to do a call block or sort it out, but they informed me that I need to 'download an app'(I have an iPhone)<br> <br> This is not going to solve the problem, as every time the call is blocked, my phone is essentially 'busy'- the problem needs to be investigated and resolved by Vodacom. Numerous calls to the call centre had the same result.