Postnet Glenfair - can not send a simple invoice, or any effort of response

Absolute terrible. After receiving an informal email from them in November requesting me to pay the annual renewal fee I then phoned and followed up with multiple emails since then (its now February) to simply email me the formal tax invoice for the postbox renewal for tax purposes. When I phone, they say I must email. When I email, I get nothing. Any single reply or some form of response effort by phone or email would help. But absolutely nothing. What business require a customer to beg for an invoice? Pathetic. My box is probably now suspended... goodbye then PostNet Glenfair. Forget about getting a response from their head office call centre as well: ***