Creditors sold debt on

Sazz26

Hi

I asked Tesco Credit for a CCA agreement and they provided one but not with the original address at the time of opening the credit, so the CCA is not genuine. They have since sold the debt on to a collections agency but I am still to receive a CCA with the correct details - should I ask for a CCA again with the debt collectors explaining I do not take ownership of the debt as I was never provided with a valid CCA? 

Thanks