Talks between General Motors and the United Auto Workers union have reportedly taken a turn for the worse over the weekend. Despite the setback, talks to form a new four-year collective bargaining agreement are still ongoing as both parties attempt to end the longest strike in 30 years.

Reuters reports GM presented an offer to the UAW recently that was basically a carbon copy of previous offers the automaker made, according to Terry Dittes, the UAW vice president in charge of the GM department, said in a letter to members.

“These negotiations have taken a turn for the worse,” he said.

“We, in this union, could not be more disappointed with General Motors,” Dittes said. “The company has shown an unwillingness to fairly compensate … the UAW.”

The UAW made an offer to GM on Saturday that covered all of its outstanding issues, including wages, health care and other big matters. GM responded to the offer in a way the union says, “did nothing to advance a whole host of issues.”

Nearly 49,000 UAW members began striking on Sept. 16th after talks stalled between the two parties and the previous contract expired. While there are a host of issues the two parties are still far apart on, one key issue is the future of several GM assembly plants in the U.S.

The union is seeking firm commitments from GM regarding its pipeline of future products for U.S. assembly plants. This is an issue that GM seems unwilling to budge on, but GM has proposed solutions to several of its idled assembly plants, including one in Ohio and Michigan.

Another sticking point is GM’s production operations in Mexico. The UAW is wanting GM to reduce Mexican production for the sake of increasing U.S. production, a move GM says is not possible because its labor costs are already the highest of the Big Three automakers in the U.S.

Despite this setback, both the UAW and GM say they will continue to negotiate around the clock to end the current strike.