Self Assessment Payment Plan

I set up a payment plan in January to settle a CHB HICBC Payments (except April) are showing online but getting overdue warnings and statement in post saying overdue/late Just called HMRC and told not to worry but it is unsettling that the payment plan seems to be overlooked?

Hi Declan Malone,
We are sorry to hear that you've received overdue notices when a repayment plan is in place.
If you'd like to discuss your plan again, or to confirm that the plan has been allocated to your outstanding amount, please contact us by webchat or phone here:
Self Assessment: general enquiries
Thank you.