Disappointed

I need assistance with a SIM card that I purchased in December which I cannot use.The sim always says no sim/sim invalid when I try to use it.One of your customer service agents advised that this sim might be damaged I’m not sure how because it’s only 2 months old and it’s always inside my pocket router.She advised she cannot assist me,so basically I’m paying for services I cannot use and Vodacom cannot help me…I’m beyond disappointed once again in Vodacoms services