just be warey of changing policies, as if your medical circumstances have changed (what u may think is slight, a life office might require more info). Don't forget about disclosing all medical info (incl info last provided on your previous application - non disclosure is an offence and one could potentially could be caught out as there is a common register between all life offices. You may be required to have a medical or get a GPs report, on the new proposal of insurance etc, which could potentially delay things considerably. My suggestion is that you should apply for new policy elsewhere (say 123.ie or any of the brokers currently running offers) meanwhile inform caledonian that you have changed your mind and wish to pay monthly direct debit (refund the balance to you) which of course you can cancel when you please, but you won't have "lapsed" your cover" - meaning that you can pay for what you actually want to be covered for.
If you still have trouble contacting your existing broker/agent or even caledonian, you should inform your new agent/broker, who, on the signature of a authorisation by you would be more than willing to pass on an instruction on your behalf (and effectively be paid to chase it up until the request is completed). This should save you a lot of time in the long run (particularly if they think you are going to take out a policy through them).
Best of luck.