Don't worry it happened to one of my friend. He forgot to send them Payment receipts that he received from IOM. He sent that receipt to CHC, London as a proof that hez done with medical already but CHC,London again requested him to provide "Delivery record" i.e DHL tracking print out. He asked IOM to provide him tracking number. Afterwards he sent that print out to CHC. After couple of weeks, CHC, London confirmed him that they are able to locate his Medical at New Delhi.
So you need to send them DHL tracking record actually. Ask IOM to provide you tracking number.
I hope it helps.
Regards
Thanks every body out there. i have no words to thanks, these your suggestion makes me alive. today i send second cse to LVO with IOM receipt and tracking record.
once again very especial thanks to ume rayan
regards