Issued a section 21 but have a Prescribed Information problem?

Hi, I’m quite new to buy to lets and have educated myself as I go along. I have now learnt the hard way of the importance of being extra careful to issue the correct information in the right time.

I have a tenant who has fallen behind on their rent and caused some damage. I used a specialist to issue a section 21.

Unfortunately, the specialist did not pick up that I had not issued the Prescribed Information.

Everything else appears in order.

The tenancy deposit information was given to the tenant via a pdf on WhatsApp. Not the best I know but is allowed.

However, with no way of showing that the prescribed information was given, my solicitor has said this will get thrown out of court with me having to pay 1 to 3 times the deposit back to the tenant.

Does anyone have any advice on how I can move forward with this?

The tenants are refusing any person to enter the property.

Thank you,

Elias