Issue with signing up with salesman at door

Hi a couple of evenings ago I had a salesman come to my door and sign me up. He said I needed to take a sim offer to get the broadband package and for them to pay the termination cost as im still in contract with current provider.

It started off being £5 for sim then crept up as I went through the sign up, and by doing this I'd get broadband for 23.99 at 256gb I think it was as it would make it a Volt? He did say I'd need to give him a different email address as I already have an O2 contract. So I did although wasn't convinced.

He also said I didn't need a tv licence for Virgin tv, I questioned this and said you need a tv licence for any live tv and bbc I player, he said no you just need it for live sports. Im not having a tv package but concerned this misinformation is being given out.

He said he would cover the termination cost so I thought Virgin would pay this, later in the conversation I discovered I had to pay and I would be credited £40. Having received the text from my current provider while he was still at the door and it was more than £40, he was insistent that the cost would ho down. Again not convinced.

Fast forward to later in the evening where I'm receiving a bombardment of texts and emails. I received one saying the sim order couldn't be processed as my email was already on record. I spent the next morning, around 2 to 3 hours on the phone trying to sort this, getting no where. I called the number on the email and yet no one could help. I was passed around for most of the morning.

I then spoke to someone who said they'd look into and call me back last night between 6 and 7. But no phone call.

Just looking for advice really, I can't cope with hours on the phone again trying to resolve and to be honest it seems a red flag about how things will pan out in the future. Am I just being harsh? How can I resolve the sim issue, which I was told i needed to get the broadband package. Thanks