Company lied to me about training

I recently joined a startup as a full stack developer. I had clearly mentioned that I have experience in backend and that I haven't worked on frontend or cloud. I was told that I'd be trained in Angular & AWS. Two days after joining, the client is expecting me to start coding in Angular, setting unrealistic goals for something I've never worked on. I've talked to my company about the situation and they said they'll manage if the client pressurises me and I can start learning and working at my own pace. What should I do in case things go south and I'm not able to deliver the world on time?