Call Centre agents useless

I was unfortunately transfered to autopage from Nashua mobile in Dec 2014. I phoned the call centre then to resolve billing issues. I signed a contract for 388.99 with nashua mobile and not 419.00 ( as autopage was now charging me this). I got invoice in Dec and debit order went off my account for 419.00 in December. I phoned the call centre then to fix the problem, which they said they would. However it seems someone there stuffed up. Today I get a letter saying that I have not paid and will be handed over for debt collection. I then try to phone the call centre to only be transfered for no reason by the first agent and then the second agent drops the call on me. Now I have to sit with this frustration because someone at autopage stuffed up!!!