Please don't give in.
First off, you do NOT owe either MA any money – any “alleged” debt is owed to the MC. If the 1st MA has been replaced, then they no longer have a mandate to collect fees from residents. Their services are no longer required. Write to them and tell them to stop harassing you. Copy this letter to the solicitor.
Next, write to the current MA (again) requesting a detailed (line-by-line) breakdown of how the fee has been calculated. This is what won the case referred to above because the resident requested this, was not provided it and the judge ruled in favour of the resident – he was entitled to this breakdown. Copy this letter to the solicitor. If you are being threatened with a judgement for non-payment of a debt, they will need to prove that the debt was incurred (i.e. service or services were provided). If they cannot provide a breakdown of the fee, they cannot prove that the debt has been incurred.
Write to the solicitor and request copies of all documents which the solicitor alleges have been lodged in connection with the claim.
Now, from a Company law perspective, you are right to be concerned about the implications of strike off. However, it's not the end of the world but can be reasonably costly to have the Company relisted (I believe in the region of 5-10k). In the meantime, there is provision in Company Law for a number of shareholders\members (residents) to convene an extraordinary general meeting. Changes to the Company personnel (directors \ secretary) can be made and you can take control. There are specific requirements in terms of notice of such meetings and rules regarding the removal of directors (they have a right to be heard. However, it will force the current directors to deal with the matter. You can make a complaint to the ODCE regarding the non-performance by the current directors of their duties (accounts, agm etc) with a view to having them disqualified personally from holding directorships. This does not affect the status of the MC.
Please do not give up. I am living under the shadow of a MC, controlled by one of the biggest builders in the country. I could be wrong but I believe that the awkward questions I have asked in the last couple of months and legitimate demands I have made have, to some extent, resulted in the builder taking steps to have the estate handed over to the local council.