i have one number whr i ported frm digi to celcom prepaid 1 month ago. but nw thinking to port back to digi smartplan postpaid. is that possible or need to wait for a period?

anyone port back to maxis from celcom?. I went to the center and paid for 128 one plan and was told to wait for 1-2days. However until now the only
message I got was "we have received your request to switch, pls call our cust svc immediately if u do not wish to proceed". at 5.30PM. There is no MNP msg that prompt me to reply YES. Should I give Celcom a call?