Sorry ... you should NOT "stop payment" on the check YOU issued unless the landlord requests that in writing. If you stay in the unit without paying, the police/court would look on your issuing a STOP PAYMENT as evidence of "THEFT of Services" or fraud.... the same as if you game them a bad credit card.
Write a polite email to the LANDLORD and stating that in a prior phone conversation between A & B on Date of... that they acknowledge receiving the check. Then say YOU noticed your check to them has NOT CLEARED you bank account. And ask, do you need us to "stop payment and issue you all a new check?" If your bank charges you a FEE ... you can state you will be deducting the fee from the NEW CHECK ... or just be nice and ignore this additional cost you will be incurring.
But get it in writing. Know the window of time between issuing the STOP PAYMENT and when the check could have been deposited and funds taken from your account (don't want BOTH checks to be redeemed either).
I agree with most of Linda's input directly above, including that it would not be a very good idea to stop payment on a check previously provided for "services rendered" --- and then stopping payment after those services have indeed already been satisfactorily rendered. This would not put OP in a particularly favorable light in a (...yes, I know, highly unlikely...) legal proceeding.
The only alternative suggestion I would make to Linda's input above would be to send the next (final?) follow-up correspondence by U.S. Mail (i.e., not by email; perhaps even using certified mail, just to create hard copy documentation of OP's communication efforts, good faith intentions --- and the legal presumption of delivery and receipt of that correspondence at the other end). Personally, I don't much like the email message avenue for money discussion at this stage in this particular instance.
If the next email goes completely unanswered, OP would really have no persuasive evidence of these last good faith efforts. When email is involved, stories (whether true or not) can range from broken recipient computer, message lost in recipient spam folder, cyber gremlins ate the email, etc.). Keep the high ground; mail a letter.
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