Overcharged and NO response from accounts/customer care

I have been using Autopage for a long time. Then they switched to this awful company "GLOCELL". There were problems from the start but with a lot of yelling and mails things got sorted out eventually. Then, around Aug/Sept last year (2017), I noticed spikes in my everyday usage. I phoned CC but all they could tell me is that it was my usage and there's nothing they can do. October, 2017, I transferred the itemised bill into excel and did the summaries. I then took my phones history and compared the usage (3G only). As I suspected it did not match by a long shot. I wrote an email to ********** and ********** at Fri, Oct 6, 2017 at 3:30 PM, but to no avail. All I got was an empty promise from a computerised response saying I will be contacted within 48 hours. Didn't happen. Second Request: Tue, Oct 24, 2017 at 8:16 AM I followed up, Same thing...auto response, no feedback. Third Request: Thu, Nov 16, 2017 at 3:23 PM I followed up again, Same thing...auto response, no feedback. All of this time I have been paying my "Normal Usage" as I compare my phone's history to the itemised bill. Then today, Mon 22 Jan 2018, I get a lovely sms saying that if I do not pay my account within 3 days I will be hard blocked. BS!!!! At 1:26 PM I sent a mail for the last time requesting feedback. I also stated that they have 3 days (72 hrs) to come back to me or I will see my lawyer and refuse to pay anything until this has been resolved. At 1.54pm Glocell phones me (My phone records all my voice activities so I have the call on record). I thanked him for responding so soon and asked that he helps me. I explained my situation and he tried to answer in favour to GloCell. I corrected him, and got some facts out the way. I have a pinnacle 250 package. This means 1-I have 250 min talk time. 2-I get 250MB data. 3.I have whatsapp recurring bundle, which provides for 600MB data (1GB before October 2017). With this being said if I reach the whatsapp cap the data pulls from my data bundle (2GB+250MB=2.25GB). So total data will be 2.85GB. GloCell confirmed billing date from 1st of month to end of month. My phone's data usage app records it the same. October 2017 my total data usage was 2.67GB of which 1.85GB was whatsapp. 1.85-0.6=1.25GB that needs to be pulled from the data bundle. Thus, 2.67-0.6=2.07GB that should be my total bundle usage, Glocell confirmed my calculations. Yet I was charged R372.2*** (R424.36incl) for data?...where, what, how, WHY!? GloCell agreed with me but said he will have to get this verified and validated and that he will get back to me. I also thanked him for his assistance and are now waiting to hear the outcome before Thursday. Just a note, example above was for 1-30 September 2017 (October 2017 bill). Billing is always a month in arrears. So, to summarise: GloCell overcharged me and refused to contact me after 3 email requests since October 2017. Even after paying my normal usage monthly they still soft blocked me for "outstanding funds". I have made an appointment with my lawyer for Thursday, 25 Jan 2018. If this is not resolved before then, I will continue with a lawsuit. Big companies always think they can bully LOYAL customers to just keep quiet and pay up...well not this guy! At the end GloCell customer service and their credit control are only there to receive an overpaid salary they do not deserve. This is really pathetic from them! I will definitely not renew my contract after it reaches end of life.