Dear
Due to the difficulties we have been experiencing lately in obtaining your payment for the goods we have delivered in agreement with the provisions of our contract of (date), we should inform you that we will not be able to send or provide delivery further for any more goods to you unless you provide us with adequate assurance for payment on aforesaid goods.
We regret having to withhold further deliveries, but, at this point in time, we have no other feasible alternative.
Please let us know promptly what your decision would be in this regard to your willingness to provide us with the adequate assurance we are requesting.
Deliveries Held Until Past Due Balance Paid