Has anyone had a problem with subscription when the client signs up and they make a payment but the invoice stays pending.

This causes huge problems as it doesn't put them in the right member class.

Really struggling 

Thanks in advance 

What payment gateway are you using? If it's Stripe, I would recommend upgrading to 4.4.10 which was just recently released. This should resolve your issue (there were some bug fixes related to Stripe payment processing in 4.4.10).