Terrible service

I took a contract with MTN. I chose to receive 4GB day and 4GB according to the options which was on the magazine they showed me, asked me to choose which contract best suits me.Only to find out that i was sold a contract which was expired so i will not receiving my 4gigs i agreed on I'm now stuck with 2gb.I was never given a copy of my contract , never signed anything. I was told all different information which led to me being in arrears. Absolute horrible experience. So disorganised. I feel like their sales agents are all up to *****. Why else would I not receive my contract, they gave me a tax invoice when I asked for my contract. Absolutely pathetic