Disciplinary - "anonymous " complaint- using mobile &driving

Following the “investigation” being concluded in my favour, the company went through the motions of a “grievance meeting”. The result of this was “no further action taken” due to “lack of evidence” (this is the outcome of every grievance involving any member of the “office team” without exception). When this was verbally questioned in a follow up meeting (not an appeal - just an informal meeting with the investigating manager) I was informed that it was viewed as “■■■-for-tat”). To say I was frustrated would be an understatement! I decided against appealing due to my belief that it would be futile.
Things have been quiet since then - but viewing other drivers going through similar on an almost daily basis is dis-heartening! I suppose drivers are the same as everyone else - a need to work & earn in order to pay the mortgage, shopping etc means that they will tolerate more than is acceptable.