if you were previously on adsl with old provider then yes they could reset your conenction but that is not possible at present with vdsl at present you need a broadband engineer visit and a fault found and fixed before you will get engineer to reset your connection
you will not get an engineer visit just for a DLM reset
I'm afraid the information you've been given is not out of date. As yet Openreach do not allow ISP's to reset DLM.
thius has been covered a few times on the forum and a search will bring up the mods BT employees) confirmation at present they cannot reset the DLM on vdsl connection
this has been ongoing and as yet thete is no progress even though openreach have allowed ISps to request DLM resets in certain circumstances - sooner BT get procedure in place the better
BUT this informationat present for BT is correct
Further to this, my previous ISP were able to do this for me in March.
It may well be the case that your previous ISP could reset it for you but that is irrelevant as you are no longer with them. As yet BT can not/will not reset DLM on VDSL.
If BT could do a reset or get an engineer to reset it for you it might be the case you would be charged £130 for the engineer visit because it was a self inflicted wound ie you caused the problem by multiple reconnection when setting up your own equipment.