Suspicious activity on my account number

R42 000 was added to my contract randomly on a number I do not use. I did a sim swop! I demand proof that I was in Zimbabwe, that I used a sim which I dont have, as I did a sim Swop. A sim with that number was given me at vodacomforu after they discovered *****. You cant just tell me I owe you R42 000 and tomorrow it will be a million Rand and I must just believe you without proof from your side. Get your act together!