final settlement in divorce

my patrner have been waiting for his wife to start divorce proceedings as she is entitled to legal aid where as we would have to pay. She contacted her solicitor and asked that we pay her a sum of money as a final settlement with the divorce, in return she would not ask for anymore money, file for divorce and take a notice of the land registry. We where unsure about how secure the agreement was but was reassured by her and her solicitor, we also recieved threats that she would stop contact with the kids etc if we didn't pay.
We paid and still divorce has not been filed, notice of the Land Registry has not been removed and now we are getting letters saying that she wants more money. Her solicitor says that divorce will be filed for soon. We have not been using a solicitor, but as far as we are concerned we stuck to our half of the agreement and a final settlement was reached. Does anyone know how this will efect the divorce process??? We are very eager to have this over and done with as it has been going on for months and months.

Can only hope you have reciepts or written confirmation that the money was paid and why. Please dont pay any more until its all drawn up in a proper consent form. I fear you have just been stung.

we have reciepts and the agreement was made with a solicitor's letter that she signed too, we also have all texts saved with her threatening us and reassuring us that she wouldn't go for anymore. Now we have her solicitor saying that she entered the agreement in good faith and we weren't honest with her about finances. Finances where never talked about as they had not changed since they split and she was well aware of what they where. She just needed money quickly as she was moving house. It was us that entered into to agreement in good faith with being reassured off both her and solicitor that that would be it and also getting threatened and harrassed. Will this effect the divorce going ahead? Will my partner have to contest it?