Some will give a release, some won't. I have tried to get released from Parker and Asses to no avail. I have no debit with them, but, they will not release. Same with RBI. I don't owe them anything, in fact, I get get paid renewals on business writen theu RBI. They still will not release just by request.
When that happens, you just have to forge your own release by not not writing for 6 months or longer depending on the carrier. You will not find this 6 month rule in your contract, so, don't bother looking. It is something that is done as an unholy alliance between companies and the
FMO's. Sometimes, if you go with an
FMO that has a better relationship with the company, they can get that 6 month waived for you.
With some
FMO/
IMO types, it can be an easy transition. With most, it is very difficult.