MTN ..... CANNOT RESOLVE ISSUES WITH NEW CONTRACT

Not at all happy with MTN. Got a call from telesales offering a so called wonderful upgrade. I thought I wS getting more of everything that I had at a good rate and agreed . When I got the mail confirming the contract , it was downgraded and I only had minutes to Mtn as apposed to a package where I had everything. To call 135 and press a million buttons and get nowhere does not work for me. I tried changing the package 2nd time and was assured I had everything, but not the case. I do not know how to resolve this and don't want to change my number as it is used for business as well and had the phone over 29 years. I wish MTN had a manager that I could talk to. I have had to pay 2 migration costs as well even though they sold wrongly not telling all .... FED UP WITH MTN