Previous mortgage company still have 'charge' on mortgage and getting nowhere!

Hi all,
I'm hoping someone has some advice on who to talk to/how to chase this.

• I had a mortgage with HSBC

• I remortgaged with Barclays in 2020

• I've just exchanged

• Solicitor has gone to get releases and found HSBC and not Barclays has a charge against my property on the land registry
• HSBC is indicating that perhaps my previous solicitor didn't file the DS1

We've all been phoning, emailing and calling for days but getting nowhere. I've got less than a week until completion.
Any ideas for how to chase/who to chase? 

^{Honestly, it's taken 5 months to get here and I'm due to complete the day after my mum starts chemo, I'm up all night vomiting over this and can't breathe. I just really, really need a break. I need the room in the house so I can help look after her as she's going through treatment.}

HI and sorry to read of the issues you are facing.
There's no 'All' on this forum as it's very much an enquiry forum for HMLR rather than a www open public forum where lots of others chip in
Happy to look at the title number if you share it and try to offer some advice if I can?

Thanks Adam. Thankfully HSBC came through this morning.
 

• HSBC supplied a DS1 to my original solicitor, and they failed to file
• HSBC now update electronically, and a very kind person raised it and had it done for me

Honestly, I wish I could tell HSBC how much they've come through for me. 

Excellent news and well done for seeing it through. 99.9% it's simplicity itself but when it goes awry like it clearly did for you it can take time to resolve.