The house cannot be repossessed without a Court Order for Sale being granted, & this should only be done at a Court hearing after you have been notified that the hearing will take place. From what you say, it seems likely that 30 June is the date of the hearing, but this should be stated in documents sent to you either direct from the Court or from the solicitor.
If you are not absolutely certain about what the position is you should take all the documents to your local CAB or law centre, or to a solicitor, so that you can be properly advised. This is very urgent - you should not just leave things to "come out in the wash". Also, as previously said, you should put the house on the market straight away unless you are totally confident (which, from your post, I don't think you are) that you can raise the money to pay the debt without selling.