Declined for no reason

I became a Vodacom customer since 1998 (with the same number I’m using now) and I converted to contract 2006 and since then not even a single day have I ever missed a single payment, not even once, the same goes for all my other creditors etc, the other day I tried applying for a new Vodacom line and I was rejected, the claim is it has to do with my credit score which I checked it’s still fine, I checked my report as well and it’s still fine…I then went to MTN and Telkom to apply for a new line which they approved (which I cancelled immediately as I know their customer service is bad,I just wanted to see if they would approve), now it makes me wonder which credit bureau Vodacom was looking at at the time, is it that they don’t want me as a client anymore???