IV fee stucked

[Imtiaz Mahmud 3]

I paid My IV fee about 2 weeks ago

but its still in process

i call then several time they said sometimes its take little longer to clear 

but last fryday they are asking to mail proof of payment from my bank then I requested to speak with supervisors they said they are busy and I requested again the representative hold

me about 5 min and come back and told

me she give it to her supervisor he will review the case

do anyone have same experience before?

please HELP