A strong electronic signature under the requirements of UETA and E-Sign Law will hold up in court.
However, my question to you is how do you know that they did not change the Ts & C's of the Agreement that you signed after you signed it? Can they provide you with a copy of the original and proof of an unbroken audit trail to that document or transaction? In addition, did they provide you with notice that you typing in your name would be used as a signature as required? If not, you may have a chance to fight this is court.
I believe that too many companies doing business on line today believe that just assigning a check mark in a database (or an "I agree" button on a web page) is sufficient to pass as a legal signature that will hold up in court. However, with the examples I mentioned above, there is a BIG difference between legally admissible and legally enforceable. Good luck, and if your company ever does need a strong electronic signature, please visit us online at www.eoriginal.com.