How do I get out of this maze?

I made the mistake of asking Telkom about its fibre package as we have fibre in our small complex. A team arrived from Telkom to review the practicalities of such a link. I decided with the team leader that there was far to much cabling required and it was far simpler to change from my ADSL link to LTE as this would more than suffice for my needs, at a later stage. I signed no acceptance of a data service. My telephone bill for the month of April then showed billing for a subscription to a data service which I am not using. I have ADSL from MWEB. Despite receiving a Reference No. to correct my statement and follow-up calls via 10210 and an email sent via Telkom's web site Help facility I am still without resolution of my problem - only deafening silence.