Did you receive the security code to your old SIM after requesting the transfer and enter that as part of the porting process? Is your 48 SIM activated and working? On the new number that they gave you or with the transferred number? When did you request the number transfer? If it's taking to long then you'll need to get onto 48 support about it. See the link in my signature below.
Hope this helps.
I am not a 48 employee so if you need to contact 48 support then use option 3 or the chat facility here.