The network cable is VMs property. Any non-standard equipment or badly fitted joints can affect your connection. There is a possibility your modification could induce noise in the network segment affecting other customers as well, so you would be well advised not to modify it yourself. Also if your signal levels are already on the high side, shortening the cable may require an adjustment in the street cabinet to maintain your service at optimal levels.
Give the faults line a call & they will arrange a tech to do this. But as it is a non-fault related issue they will charge you £25 to do the job.
VM BB TV Landline. Vonage 2nd line. Freeview/Freesat HD, ASDA/Tesco PAYG Mobile. Customer since 1993
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