Is this theft...

Wow what shocking service.... I took out a new contract on an advertised special. I the discovered that the package I has taken was not what I had been given. I went back to the store and was told there was an error in the code on the advert and that's why I had been given the wrong contract. I was then told that what I had was a better deal as I could covert my airtime to data. It turned out that this was not true. I went back to the store, to be told the special was over and I could not get the same package. After a fight they migrated my package. Only to find I was not getting the add on data I had requested. Back to the store in La Lucia mall to be told I could not get the extra data as that special was over. However they would migrate me from Made for me XS To Made for me S... At a higher price... I took the option and was paying for three months before I discovered that although I am paying for the S package I am only getting the XS minutes and data. I went into La Lucia for the 4th time. They confirmed there was a problem and logged a query. That was on 8 December... I followed up 3 more times and have not had the problem resolved and have had no feedback. They are taking my money each month and not giving me what I am paying paying for. It's nothing short of theft...