Migration from Nashua Mobile to MTN

Indeed it was an ******* migration failing to consider the clients consent,I have requested MTN in February 2015 to provide me with a copy of contract that I entered into with Nashua Mobile,I was promised but up until to date nothing is forthcoming instead my debit is fluctuating,sky rocketing and totally different than what Nashua Mobile used to debit on a monthly basis.At the branches and call operators give you long stories that does not assist a devastated client,they will tell you about the internet that runs continuously at the back even if you switch off your phone,the question is why now? it never happened when Nashua was still up and running, MTN is a ******* I WILL NEVER EVER upgrade my contract with them. We as consumers we are not protected at all with this supplier and I will never rest until I get my contract and a billing statement that will indicate each call I dialed, to make matters worse I frequently use a business cell phone with an abundance of airtime and data bundles as well as landline is at my disposal for easily accessing internet. Can someone do his/her job accordingly,five years back my salary never increased so I plan according to my budget.