Unfair liabilities

Good day

If sign up for vox fibre but u fortunately where we stay here is no Fibre only lte.. Now my husband spoke to someone on whattssp.. But now they did send us a rooter but for fiber.. They delivered it at home when we want to connect it says fibre.. We emailed them saying they send us fibre and we need lte.. Now they are billing us for a fibre whe don't have or used.. Since the day we got the rooter they send an invoice to my husbands mail and says they cutting our service because no payment was made come on why must I pay for a thing I didn't use and no fibre lines is