Hi there, not sure if you saw my last query but I will reply in the meantime anyway. In the circumstances you will only have liability for these charges if you had been made aware of these terms and accepted them. For example, this could have happened when you agreed to ship the item and they would have issued you with these terms and you subsequently accepted them. They cannot charge you under terms you were not aware of or contractually bound to. Therefore, if they only had an agreement with the recipient and not you, it would be very difficult for them to say that you are now liable under those terms if you were not a party to them.
If you were notified of, and accepted these terms, then you could have potential liability. In these circumstances you should only be liable for the losses suffered by the shippers had the recipient paid them as normal. So you need to look at what amount is outstanding, i.e. what they should have paid, and only make you responsible for that. Seeking to recoup more than that could amount to a penalty clause which can be legally unenforceable.
Hat you could is to send them a payment for the amount you believe you should pay and clearly mark it as being in ‘full and final settlement’ of this dispute and if they accept it, or bank the cheque if paid that way, then they would be severely reducing their prospects of taking this further for the remainder.
I hope this has answered your query. I would be grateful if you could please take a second to leave a positive rating (3, 4 or 5 stars) as that is an important part of our process and recognises the time I have spent assisting you. If you need me to clarify anything before you go - please get back to me on here and I will assist further as best as I can. Thank you