Not receiving One Time Passcodes from bank

I recently moved 5 plans onto Lebara. I can not receive a OTP by SMS from my bank now. I have used the chat 4 times and been told it was fixed. It wasn’t. I then complained and received a call the following day saying it was fixed. It isn’t. This only affects one bank. They e confirmed the codes are being sent but I am still not receiving them. Other financial institutions OTP’s are coming through. The OTP sends to another number fine, just not to my lebara sim which is a physical sim in an iPhone. I’ve checked SMS spam and done everything I can think of. I was asked to confirm if it was working following my call from customer services. I could not do it at the time but have since confirmed it is still not working but have not received the follow up call to tell them, although I did follow up with yet another email. It’s becoming a real problem being unable to access money and I’m getting to the stage where I’ll need to leave lebara and go back to another provider if they can’t fix this.

having same problem, did you got any fix to it

I was asked to add £5 credit just now with the same issue receiving OTP from BT, even though I'm on a monthly contract.