"Getting them to try to sue you for non-payment (per your opening post) is a waste of time as a way to force them to give you a valid MAC . If you owe them money , they will win . You will be offline for ages ."
A company has to go through the procedure I outlined in my original post in order to recover payment. Given the choice of handing over a MAC or having to go through that process, they'll hand over the MAC.
"Paying the arrears and the notice before sueing negates your opening post as they wouldn't have grounds for sueing you in the first place , so it is no way to force them to give you a valid MAC ."
You offer to pay them the arrears and notice period, if they didn't hand over your MAC and lodged a county court claim. It's 100% unlikely it would come to this. Companies just want to turn a profit at the end of the day, not get embroiled in legal cases.
"Paying the arrears and notice will not neccessarily get you a valid MAC as that is what I did . They gave an invalid MAC , said I'd be liable for any future connection charges if I didn't use the MAC as I'd still be on their system , thereby leaving me the option of continuing to pay them or having no internet , for months ."
You don't pay them until you've been given a MAC and have switched providers. A company has to negotiate with a debtor. It doesn't just embark on a county court claim straightaway. This gives you weeks to ensure that you are able to switch providers.
"That is why I had no option but to go the Managing Directors house route ."
That could be considered harassment, which is a criminal offence
"Now you could sue them . This would be costly as you'd have to prove loss of earnings , emotional stress or loss of whatever it was you were claiming (loss of earnings probably wouldn't cut it as they'd say you should have been on a business tariff). "
It would be difficult to sue a company for withholding the MAC, which is why I've suggested persuading them to hand over the MAC by stopping payments.
"They have you by the balls really as Ofcom will not do a thing in individual cases . "
Not at all. If you withhold money, you have them by the balls, for the reasons you describe when you say suing them is impractical. Ofcom will do nothing to support you, however. Regulators are a cynical bunch, it's easier to ignore individuals than companies.