Poor customer service

I've been experiencing a problem whenever I load Data,mtn accept it but it fails to connect to internet. I bought 100gig on the 20th of September and it's still reflecting on my balance but can't connect. I bought a latest Samsung ,new sim card and did a sim swap; the data still reflects but doesn't connect.I phoned MTN,they tried to assist with no luck, I pursued the matter and was issued with a ref number but never got back to me as promised. I then emailed them and they rep**** after a week acknowledging my email. Till this day my issue hasn't resolved

I would like MTN to refund my account with airtime I bought the data with or reload the data on my other MTN number. Sad part is that this 100gig it expire soon