Dreadful company! Do not respond to emails to cust...

Dreadful company! Do not respond to emails to customer service. Completed in March. Still awaiting completion certificate in August despite emails and calls. State 'normal' time us 3 - 6 months which is wrong! Should only be 2 - 3 months max. No communication. Tried to get another years payment after my last payment made and then offered me a 'loan' to repay. AVOID at all costs