I'm not too familiar with policies and procedures of sperm banks, but I think they should be able to answer all of your questions to your satisfaction before selling you the product. If not, then please talk to your physician before making such a decision. Only after all of your doubts and fears are answered, should you in all good conscience go through with the procedure.
Good luck, and keep us posted.

There is no 'refund' in this choice you are making.