Incompetence showed by Call Centre Staff

I made an online enquiry regarding a cellphone contract for a family member. I received a call from Sharon telling me she can't verify my details because I was blocked due to failing a previous attempt at verifying my identity. I have received NO call from ANY call centre staff regarding this matter before and I find it absolutely ridiculous that they somehow contacted the wrong person regarding this enquiry and cannot unblock me because of their incompetence. I will state it clearly here so you understand me, I had no conversation with a 'Jenny' as claimed by Sharon. You contacted someone else and I want this matter sorted. I will however take my business somewhere else regarding this contract because this is ridiculous customer service