Taxe Returns

I was submitting my SARS taxe returns, and finds out that I'm owing, I questioned SARS, they said I have two IRP5's on my name, hell no I told them that I'm working for Telkom as Technician, they told me I have been working for another company Life and Brand Portfolio, I told them I dont know that company, now I'm owing SARS big money because of them. SARS gave me their email address and phone number I phone them, it been a mnth and 2 weeks now, waiting for this company to resolved this, they told me they gonna open a case cause they know nothing about this, so opening a case can take up to 5 weeks. They need to remove the IRP5 in the system that they send under my name.