Old Boss Calling me

Hi, this might sound a bit strange but i need advise urgently. on 19/11/11 i at 1:25AM i received a call from my old boss (i left work in 09/2011) and she called me asking me for drugs. i wasnt to sure what to do so i went with the flow of conversation and then she said she would come down near the university at which i studied and i said ok (i thought it was a friend playing a sick prank call on me) when she arrived here she called me saying she was outside and then when i went outside she was actually there in a taxi so i ignored her fully and she did not see me at all and she called me. when she called i told her i dont know why she is calling me and that i thought this was some sick joke and told her i will inform the police if she did it again. question 1) have i done anything wrong? question 2) is this a breach of DPA 1998? question 3) what should i do? i have the proof of call logs and text messages? regards