<human>: Can you give me a shortened version of the text?

In Fall 2013 (can't remember exact dates) I was contacted by Global for an outstanding balance on a store credit card that had gone to collections. (I had lost my job earlier that year causing this). They let me know that they were willing to settle if I paid 80% of the remaining balance and sent them a letter stating why I was unable to pay the full amount. I sent the letter almost immediately along with cheque for the settlement amount. 

Now it's been almost a year and about two months ago they called my parents (I'm currently living overseas) about an outstanding balance but could not give them more information. I tried calling them myself but they won't talk to me because I'm not in the country which is fucking annoying because I answered all of their security questions so I don't know why this matters. (Sorry if there is actually a good reason for that). Anyway, they gave me the number for their client who informed me that I still owed the 20%. 

I wrote Global a letter about the situation and authorized my mother to act on my behalf since she's still in Canada. Since then she has called several times and left messages but nobody ever calls her back. We wrote a letter to the agent initially responsible for the offer and have heard nothing. 

What can I do about this if they won't call me back? Is it still hurting my credit score? 

After I sent the first cheque I had requested that this be removed from my history and after I was told what they needed from me to complete this, I never heard from them again about that either. I'm more than happy to pay the remaining bit if it means this will go away, but I don't think it's fair that they won't make contact. 

Any help or advice would be appreciated!
<bot>: Was offered settlement - paid settlement price - year later they contacted me asking for remaining balance and now won't return my calls to discuss.