Entering te vpi and vci values manually should be Ok, ASIS kit is usually good at taking direct configuration changes.
You (we) seemed to have covered all the obvious options and it does seem like either a wire or something else is causing the issues, maybe like in UK, BT do not like users using Modems that are not Broadcom or Lantiq (Infineon) and if possible try to obtain a new replacement preferable a separate modem and router.
Usually for ADSL the MediaTek devices work well especially with Annex M for increased upload synch speed, but on this occasion you are unlucky
In a completely sane world, madness is the only freedom (J.G.Ballard).
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